Life Expectancy Calculator: How Long Will I Live?

How many years do you have left? While no one can predict the future with certainty, life expectancy calculators use statistical averages to estimate how long you might live based on factors like your current age and sex. If you are not sure how old you are exactly, start there first. This guide explains how life expectancy is calculated, what the numbers mean, how it varies around the world, and what you can do to improve your odds. For a broader overview of age calculation methods, see our complete age calculator guide.

What Is Life Expectancy?

Life expectancy is a statistical measure that estimates the average number of years a person is expected to live based on current mortality rates. It is not a prediction for any individual but rather an average derived from population-level data. The concept has been studied since the 17th century, when English statistician John Graunt first analyzed mortality records in London to understand patterns of death.

There are two main types of life expectancy:

• Life expectancy at birth: The average number of years a newborn is expected to live if current mortality rates remain unchanged throughout their lifetime. This is the most commonly cited figure.
• Life expectancy at a given age: The average number of additional years a person of a specific age can expect to live. This is often higher than what you would calculate by simply subtracting your age from life expectancy at birth, because you have already survived the risks of younger years.

Our life expectancy calculator uses simplified global averages (76 years for males, 81 years for females) to give you a quick perspective on where you stand. For more personalized estimates, actuarial tables from organizations like the Social Security Administration provide age-specific data. Understanding your chronological age is the first step in calculating life expectancy.

The History of Life Expectancy Measurement

The systematic study of human lifespan began with early demographers and actuaries who needed to understand mortality patterns for insurance purposes.

Early Pioneers (1600s-1700s)

John Graunt (1620-1674) is considered the father of demography. In 1662, he published "Natural and Political Observations Made upon the Bills of Mortality," analyzing London's death records. He discovered that about 36% of children died before age 6, and he created the first life table estimating survival rates at different ages.

Edmond Halley (1656-1742), better known for Halley's Comet, constructed the first scientifically rigorous life table in 1693 using data from Breslau, Germany. His work allowed life insurance companies to calculate premiums based on age-specific mortality risks.

Modern Development (1800s-Present)

Life tables became increasingly sophisticated as vital registration systems improved. By the 20th century, national statistical agencies worldwide began publishing detailed life expectancy data. Today, the World Health Organization (WHO) tracks life expectancy for every country, updating figures annually.

How Our Life Expectancy Calculator Works

Our calculator is designed to be simple and informative. Here is what it does:

1. Enter your date of birth and select your sex (male or female)
2. The calculator determines your current age
3. It applies global average life expectancy (76 for males, 81 for females)
4. It computes your estimated remaining years and weeks
5. It shows a progress bar indicating what percentage of your estimated life you have lived

The result gives you four key numbers:

• Life Expectancy: Your estimated total lifespan in years
• Years Remaining: Estimated years left based on the average
• Weeks Remaining: The same figure converted to weeks for a more tangible perspective
• Life Lived: The percentage of your estimated total life that has already passed

Life Expectancy by Country

Life expectancy varies dramatically around the world. Access to healthcare, nutrition, sanitation, economic stability, and public health policy all play significant roles.

Source: World Health Organization (WHO) data. Figures are approximate and based on the most recent available statistics.

Why Do Women Live Longer Than Men?

Across virtually every country in the world, women outlive men by an average of 4-7 years. This gap has been consistent throughout recorded history and is observed in many other mammalian species. Several factors contribute to this remarkable disparity:

• Biological advantages: Women have two X chromosomes, which provides a backup if one carries a harmful mutation. Estrogen also has protective effects on the cardiovascular system before menopause.
• Behavioral differences: Men are statistically more likely to engage in risky behaviors, including higher rates of smoking, alcohol consumption, and dangerous occupations.
• Healthcare utilization: Women tend to visit doctors more regularly and seek medical care earlier when symptoms appear.
• Occupational hazards: Men are overrepresented in physically demanding and dangerous jobs, including construction, mining, and military service.
• Cardiovascular health: Men develop heart disease earlier on average than women. Heart disease remains the leading cause of death globally.

Life Expectancy Gap by Country

The male-female longevity gap varies considerably around the world. Russia has one of the largest gaps (over 10 years) due to high male mortality from alcohol and accidents, while some developing countries have smaller gaps due to high maternal mortality rates.

Blue bars: male life expectancy. Purple bars: female life expectancy. Source: WHO 2024.

Life Expectancy Over Time

Human life expectancy has increased dramatically over the past centuries. Here is a historical perspective:

It is important to note that the low life expectancy figures in earlier eras are heavily influenced by high infant and child mortality rates. If a person in ancient Rome survived childhood, they could reasonably expect to live into their 60s or 70s. The averages are dragged down by the large number of deaths in infancy. For a look at important age milestones throughout life, see our dedicated guide.

Celebrity Life Expectancy Examples

Looking at the lifespans of well-known individuals helps illustrate how life expectancy varies based on era, lifestyle, and circumstances. Here are some notable examples:

Short Lives: When Talent Departed Early

Not everyone exceeds their life expectancy. Some influential figures died tragically young, demonstrating how lifestyle factors and circumstances can drastically reduce lifespan:

• Wolfgang Amadeus Mozart (1756-1791) died at 35, likely from rheumatic fever complications
• James Dean (1931-1955) died at 24 in a car accident
• Amy Winehouse (1983-2011) died at 27 from alcohol poisoning
• Kobe Bryant (1978-2020) died at 41 in a helicopter crash
• Chadwick Boseman (1976-2020) died at 43 from colon cancer

These examples remind us that life expectancy is a statistical average, not a guarantee. Accidents, disease, and lifestyle choices can dramatically alter individual outcomes. Use our age in days calculator to see exactly how many days you have lived so far.

US Life Expectancy Since 1900

The United States has seen dramatic gains in life expectancy over the past century, though progress has stalled in recent years. Data from the CDC National Center for Health Statistics.

The dip in 2020-2021 was primarily caused by the COVID-19 pandemic, drug overdose deaths, and other factors. Life expectancy has since recovered toward pre-pandemic levels.

Your Life in Weeks

One powerful way to visualize your life is to think about it in weeks. If you live to 80, your entire life spans about 4,174 weeks. If you are 30, you have already used about 1,565 of those weeks, leaving roughly 2,609 weeks ahead.

This concept was popularized by writer Tim Urban in his "Wait But Why" blog post "Your Life in Weeks," which visualizes an entire human life as a grid of boxes representing weeks. Each row is a year, and each column is a week. The visual impact of seeing your remaining weeks as a finite number of boxes is a powerful motivator for intentional living.

Use our life expectancy calculator to see your personal weeks remaining based on your exact age and sex.

Factors That Affect Life Expectancy

While our calculator uses simple averages, your actual life expectancy is influenced by many factors. Here are the most significant ones.

Genetics

Research suggests that genetics account for approximately 20-30% of the variation in human lifespan. If your parents and grandparents lived long lives, you may have a genetic advantage. Specific genes related to DNA repair, immune function, and cardiovascular health have been linked to longevity.

Diet and Nutrition

A balanced diet rich in fruits, vegetables, whole grains, lean proteins, and healthy fats is consistently associated with longer life. The Mediterranean diet, in particular, has been linked to reduced risk of heart disease, cancer, and cognitive decline. Populations in "Blue Zones" (regions with the highest concentrations of centenarians) typically eat plant-based diets with moderate caloric intake.

Physical Activity

Regular exercise is one of the strongest predictors of longevity. The WHO recommends at least 150 minutes of moderate aerobic activity or 75 minutes of vigorous activity per week. Studies show that regular exercisers live an average of 3-7 years longer than sedentary individuals. Even modest activity like daily walking provides significant benefits.

Smoking

Smoking is the single largest preventable cause of death worldwide. Smokers lose an average of 10 years of life expectancy compared to non-smokers. The good news is that quitting at any age provides benefits. Quitting before age 40 reduces the excess risk of death by about 90%.

Alcohol Consumption

Heavy alcohol use reduces life expectancy by an estimated 10-12 years. Moderate consumption (defined as up to one drink per day for women and up to two for men) has shown mixed results in research, with some studies suggesting modest cardiovascular benefits and others finding no net benefit.

Body Weight

Both obesity and being significantly underweight are associated with reduced life expectancy. Obesity increases the risk of heart disease, type 2 diabetes, stroke, and several cancers. A body mass index (BMI) between 18.5 and 24.9 is generally associated with the lowest mortality risk.

Social Connections

Strong social relationships are associated with a 50% increase in the likelihood of survival over a given period. Loneliness and social isolation have been compared to smoking 15 cigarettes a day in terms of their impact on mortality. Maintaining friendships, family connections, and community involvement matters for longevity.

Mental Health

Depression, chronic stress, and anxiety are associated with shorter lifespans. Chronic stress increases cortisol levels, which can damage the cardiovascular system, weaken the immune system, and accelerate aging. Managing stress through mindfulness, therapy, hobbies, and social support can improve both quality and length of life.

Access to Healthcare

Regular preventive care, early detection of diseases, and access to treatment are major determinants of life expectancy. This is why life expectancy varies so much between countries with strong healthcare systems and those without.

The Blue Zones

Blue Zones are five regions in the world where people live significantly longer than average. Researchers have identified common lifestyle factors that contribute to their longevity:

Common themes across all Blue Zones include: natural daily movement (not gym workouts), plant-heavy diets, a sense of purpose, stress-reduction routines, moderate alcohol consumption, belonging to a community, putting family first, and maintaining close social circles.

Life Expectancy by US State

Life expectancy varies significantly within the United States. Factors like income, education, healthcare access, obesity rates, and smoking prevalence create a gap of over 7 years between the healthiest and least healthy states. Data from the CDC National Center for Health Statistics shows these regional disparities:

US State Life Expectancy: Top vs. Bottom 5

The 6.3-year gap between Hawaii and Mississippi is equivalent to the difference between the United States and countries like Mexico or Brazil. Within a single nation, socioeconomic factors create life expectancy disparities as large as those between developed and developing countries.

Life Expectancy by Race and Ethnicity in the US

Significant disparities in life expectancy exist across racial and ethnic groups in the United States. These differences reflect historical inequities in healthcare access, income, education, and environmental exposures.

The COVID-19 pandemic disproportionately affected minority communities, widening gaps that had been slowly narrowing for decades. American Indian and Alaska Native populations experienced the largest decline, losing over 5 years of life expectancy between 2019 and 2021. Source: CDC NCHS.

Life Expectancy vs. Healthy Life Expectancy

An important distinction is between total life expectancy and healthy life expectancy (also called health-adjusted life expectancy or HALE). HALE measures the number of years a person can expect to live in good health, without significant disability or disease.

Globally, the gap between life expectancy and healthy life expectancy is about 8-10 years. This means that while the average person might live to 73, they may spend the last 8-10 years dealing with significant health challenges.

This is why focusing on "healthspan" (years of healthy life) is as important as focusing on "lifespan" (total years). Understanding the difference between your biological age and chronological age can also help you assess where you stand.

How to Potentially Increase Your Life Expectancy

Based on the research, here are evidence-based actions that can add years to your life:

• Stop smoking: Adds up to 10 years. The single most impactful change a smoker can make.
• Exercise regularly: Adds 3-7 years. Even 30 minutes of walking per day helps.
• Eat a plant-rich diet: Adds 2-4 years. Focus on vegetables, fruits, whole grains, and legumes.
• Maintain a healthy weight: Adds 1-3 years. Keep BMI between 18.5 and 24.9.
• Limit alcohol: Adds 1-3 years. Avoid heavy drinking; moderate or abstain.
• Stay socially connected: Adds 2-5 years. Maintain meaningful relationships.
• Get adequate sleep: Adds 1-3 years. Aim for 7-9 hours per night consistently.
• Manage stress: Adds 1-3 years. Practice mindfulness, meditation, or other stress-reduction techniques.
• Get regular checkups: Early detection saves lives. Follow recommended screening schedules.

Understanding Life Tables and Actuarial Data

Life insurance companies and government agencies use detailed actuarial life tables to calculate life expectancy at every age. These tables are based on observed mortality rates for large populations and are updated regularly.

For example, according to the US Social Security Administration actuarial table, a 65-year-old male in the United States has a remaining life expectancy of about 17 years (to age 82), while a 65-year-old female has about 20 years remaining (to age 85). These numbers are higher than the life expectancy at birth because the person has already survived the mortality risks of younger ages. If you are approaching retirement, our retirement age calculator can help you plan around these figures.

This is an important concept: the older you are, the higher your total expected lifespan becomes. A person who has reached 90 years old has a higher expected age at death (perhaps 94-95) than someone who is only 20 (who faces decades of accumulated risk).

Remaining Life Expectancy by Current Age

This table shows how many additional years you can statistically expect to live based on your current age, according to the Social Security Administration actuarial tables. Notice how the expected age at death increases as you get older:

Key insight: A 65-year-old man who has already survived past the average life expectancy at birth (76) can now expect to live to about 83. Each year you survive, you "beat the odds" of that year's mortality risk, and your expected total lifespan increases. This is why life expectancy calculators that account for current age provide more accurate estimates than simply using life expectancy at birth.

The Science of Longevity: What Research Tells Us

Modern longevity research has identified several key factors that determine how long we live. Understanding these can help you make informed choices about your health.

Telomeres and Aging

Telomeres are protective caps at the ends of chromosomes that shorten with each cell division. When they become too short, cells can no longer divide properly, contributing to aging. Research by Dr. Elizabeth Blackburn (Nobel Prize 2009) showed that chronic stress accelerates telomere shortening, while exercise and meditation can slow or even reverse the process. The National Institutes of Health (NIH) continues to fund research into telomere biology and interventions that might extend healthy lifespan.

Caloric Restriction

Studies in various species, from yeast to primates, have shown that reducing caloric intake by 20-40% (while maintaining adequate nutrition) can extend lifespan by 30-50%. The mechanisms involve reduced oxidative stress, improved insulin sensitivity, and activation of longevity genes like SIRT1. Human trials are ongoing, though the extreme nature of caloric restriction makes it impractical for most people.

The Gut Microbiome

The trillions of bacteria in your gut play a crucial role in health and longevity. Centenarians in Blue Zones tend to have diverse, healthy microbiomes. A diet rich in fiber and fermented foods promotes beneficial gut bacteria, which in turn reduces inflammation and supports immune function.

Life Expectancy Comparison: Global Regions

Life expectancy varies dramatically across world regions, reflecting differences in healthcare systems, economic development, and public health infrastructure.

Life expectancy by WHO region. Source: WHO Global Health Observatory 2024.

Leading Causes of Death by Age Group

Understanding what causes death at different ages helps explain life expectancy patterns. Data from the CDC National Vital Statistics Reports:

Key insight: Accidents dominate mortality in younger age groups, while chronic diseases (heart disease, cancer) become the leading causes after age 45. This is why age milestones past 40 often include increased health screenings.

The COVID-19 Impact on Life Expectancy

The COVID-19 pandemic caused the largest single-year decline in US life expectancy since World War II. Understanding this impact provides context for current life expectancy figures.

The 2.4-year decline between 2019 and 2021 was unprecedented in modern times. Some populations were hit harder than others, with American Indian/Alaska Native communities losing over 5 years of life expectancy. By 2023, overall life expectancy had recovered to near pre-pandemic levels, though the impact varied by demographic group.

Occupation and Life Expectancy

Your job can significantly affect how long you live. Research from the National Institute for Occupational Safety and Health (NIOSH) shows substantial differences by occupation:

Factors explaining these differences include:

• Physical hazards: Construction, mining, and manufacturing workers face higher injury and fatality rates
• Chemical exposures: Certain occupations involve carcinogens and toxic substances
• Stress levels: High-stress jobs correlate with cardiovascular disease
• Income and healthcare: Higher-paid professions typically have better health insurance and access to care
• Education: More educated workers tend to make healthier lifestyle choices

Education Level and Life Expectancy

One of the strongest predictors of longevity is educational attainment. According to research from the U.S. Census Bureau and CDC:

The gap between those with less than a high school education and those with graduate degrees is over 8 years of additional life. This reflects not just income differences, but also health literacy, access to care, social networks, and health behaviors.

Marriage and Life Expectancy

Married people tend to live longer than those who are single, divorced, or widowed. This effect is stronger for men than women:

The marriage benefit likely comes from social support, shared economic resources, spousal monitoring of health behaviors, and reduced engagement in risky activities. The "widowhood effect" (increased mortality after losing a spouse) is well-documented, especially for men in the first year after their spouse's death.

Sleep and Life Expectancy

The relationship between sleep and longevity follows a U-shaped curve. Both too little and too much sleep are associated with increased mortality risk.

The optimal range for adults is 7-8 hours per night. Consistent sleep patterns (going to bed and waking at the same time) are also associated with better health outcomes than irregular sleep schedules.

Pets and Longevity

Research suggests that pet ownership, particularly dog ownership, may contribute to longer life. A Swedish study of 3.4 million people found that dog owners had a lower risk of death from cardiovascular disease. Benefits may include:

• Increased physical activity (daily walks)
• Reduced stress and anxiety
• Social connection (meeting other pet owners)
• Daily routine and purpose

Religion, Spirituality, and Life Expectancy

Multiple studies have found an association between religious practice and longevity. Research published in the journal Social Psychological and Personality Science found that regular religious service attendance was associated with a 4-7 year increase in life expectancy. Proposed mechanisms include:

• Social support from religious communities
• Lower rates of smoking and alcohol use in some traditions
• Stress reduction through prayer and meditation
• Sense of purpose and meaning
• Regular engagement in community activities

The Longevity Diet: What Centenarians Eat

Researchers studying centenarians have identified common dietary patterns that may contribute to extreme longevity:

Climate and Environment Effects

Where you live can affect your lifespan through air quality, climate, and environmental factors:

Air Pollution Impact

According to the WHO, air pollution reduces global average life expectancy by about 1.8 years. The effect is most pronounced in heavily polluted cities in South and East Asia, where some residents may lose 5+ years of life expectancy due to air quality.

Climate and Longevity

Some research suggests moderate climates may support longer life. Extremely hot or cold environments can stress the body and exacerbate cardiovascular and respiratory conditions. Mediterranean climates (mild winters, warm dry summers) are often associated with longevity, though lifestyle factors likely play a larger role than climate alone.

Intermittent Fasting and Longevity

Emerging research on intermittent fasting suggests potential longevity benefits, though human studies are still limited. The most studied approaches include:

• 16:8 fasting: Eating within an 8-hour window daily
• 5:2 fasting: Normal eating 5 days, reduced calories (500-600) 2 days
• Alternate-day fasting: Alternating between normal eating and fasting/reduced calories

Animal studies show significant lifespan extension with caloric restriction and fasting. Human evidence is promising but less conclusive. The NIH continues to fund research in this area.

Centenarian Secrets: Common Traits

Studies of centenarians worldwide have identified common characteristics beyond diet and exercise:

Notably, centenarians tend to "let go" of stress more easily than the general population. This psychological resilience may be as important as physical health factors in achieving extreme longevity.

Exercise Types and Longevity Impact

Not all exercise is equal when it comes to extending life. Research from the American College of Sports Medicine and multiple longitudinal studies reveal the relative benefits of different activity types:

Added years of life expectancy vs. sedentary lifestyle. Source: Copenhagen City Heart Study, Mayo Clinic Proceedings.

The striking longevity benefit of racquet sports (tennis, badminton) likely comes from their combination of physical activity, hand-eye coordination, and social interaction. Team sports similarly combine exercise with social connection.

Technology and Life Expectancy

Emerging technologies may significantly impact future life expectancy:

Artificial Intelligence in Healthcare

AI systems are increasingly used for early disease detection. Google's AI can detect breast cancer in mammograms more accurately than radiologists. Early detection of cancer, heart disease, and other conditions could add years to average life expectancy as these technologies become widespread.

Gene Therapy

CRISPR and other gene-editing technologies offer the potential to treat genetic diseases and possibly slow aging at the cellular level. While human longevity applications are still experimental, animal studies have shown promising results.

Wearable Health Monitoring

Smartwatches and fitness trackers that monitor heart rate, sleep, and activity can detect health problems early. Apple Watch has saved lives by detecting irregular heart rhythms (AFib). As these devices become more sophisticated, they may help extend healthy life by prompting earlier medical intervention.

Calculating Your Personal Life Expectancy

While our simple calculator provides a quick estimate, you can get a more personalized figure by considering multiple factors:

Step 1: Start with Base Life Expectancy

Use the SSA actuarial table for your current age and sex. A 50-year-old male has about 30 more years (to age 80); a 50-year-old female has about 33.6 more years (to age 83.6).

Step 2: Apply Adjustments

Step 3: Calculate Your Estimate

Add the base life expectancy to your adjustments. Remember, this is still a statistical estimate, not a prediction. Individual outcomes vary enormously.

Life Expectancy Myths Debunked

Several common misconceptions about life expectancy deserve clarification:

Myth: Life expectancy at birth means most people die at that age

Reality: Life expectancy is an average, heavily influenced by infant mortality. In historical eras with high child mortality, life expectancy at birth was 30-40 years, but those who survived childhood often lived into their 60s-70s.

Myth: Genes determine everything

Reality: Genetics account for only 20-30% of longevity. Lifestyle choices, environment, and access to healthcare explain the majority of variation.

Myth: Exercise has to be intense to add years

Reality: Even moderate activity like daily walking provides significant longevity benefits. The biggest gains come from moving from sedentary to minimally active, not from moderate to intense exercise.

Verified Oldest People in History

These are the oldest verified individuals in recorded history, according to the Gerontology Research Group and Guinness World Records.

Notable: Jiroemon Kimura is the oldest verified male in history. Nine of the top ten are women, reflecting the global pattern of female longevity advantage.

Current Living Supercentenarians

As of early 2026, there are approximately 50-100 verified supercentenarians (people aged 110+) alive worldwide. The oldest living person changes frequently as these individuals are in the final years of extraordinarily long lives. Visit the Gerontology Research Group for the current list.

Note: Supercentenarian records change frequently. The individuals listed above were among the oldest living people at the time of writing. For the most current information, consult the Gerontology Research Group or Guinness World Records.

How to Calculate Your Life Expectancy: Step-by-Step

While our calculator does the work for you, understanding the methodology helps you interpret the results. Here is how life expectancy is calculated:

Method 1: Simple Calculation (Our Calculator)

1. Determine your current age using your date of birth (learn how old you are exactly)
2. Apply base life expectancy: 76 for males, 81 for females
3. Subtract your current age from base life expectancy
4. Result: Estimated remaining years

Example: A 35-year-old female would have approximately 81 - 35 = 46 years remaining, or 46 x 52 = 2,392 weeks.

Method 2: Actuarial Life Table (More Accurate)

1. Find your age and sex in the SSA Period Life Table
2. Look up remaining life expectancy at that exact age
3. Add adjustments for known health factors, lifestyle, family history

This method accounts for the fact that someone who has already survived to age 60 has demonstrated resilience and faces different statistical odds than a newborn.

Method 3: Comprehensive Health-Adjusted Calculation

Some advanced calculators (used by insurance companies) factor in:

• Current health conditions (diabetes, heart disease, cancer history)
• Lifestyle factors (smoking, alcohol, exercise, diet)
• Family history (parental ages at death, genetic diseases)
• Socioeconomic status (income, education, occupation)
• Geographic location (state, urban vs. rural)

These comprehensive models can adjust life expectancy by 10-15 years in either direction from the population average.

Lifestyle Impact on Life Expectancy

Research from the National Institutes of Health and Our World in Data shows how specific lifestyle factors affect your estimated lifespan.

Years Gained or Lost by Lifestyle Factor

Years Gained by Positive Habits

Frequently Asked Questions

Global Life Expectancy Trends and Projections

According to the Our World in Data research project, global life expectancy has more than doubled since 1900 and continues to rise in most countries. Here are the key trends:

Current Global Statistics (2024)

• Global average: 73.4 years
• Developed countries average: 80+ years
• Developing countries average: 65-75 years
• Least developed countries: 55-65 years

Projections for 2050

The United Nations Population Division projects that by 2050:

• Global life expectancy will reach approximately 77 years
• Most developed countries will exceed 85 years
• The gap between developed and developing countries will narrow
• The number of centenarians worldwide will increase from 500,000 to over 3 million

Factors Driving Future Increases

Life Expectancy Calculator Comparison: Types Available

Different life expectancy calculators serve different purposes. Here is how they compare:

Our free life expectancy calculator provides a quick, educational estimate. For financial planning purposes (like retirement or life insurance), consult with a professional who can apply actuarial tables specific to your situation.

Related Age Calculations

Understanding life expectancy is just one aspect of age calculation. Explore these related topics:

• Complete Age Calculator Guide - learn all methods of calculating age
• Chronological Age Explained - your exact age for assessments
• Korean Age Calculator - how age works in Korean culture
• Lunar Age Calculator - traditional Chinese age counting
• Age Difference Calculator - compare ages between two people
• Age in Days Calculator - how many days have you lived
• Birthday Calculator - countdown to your next birthday
• Birth Year Calculator - find birth year from current age
• Leap Year Birthday - for those born on February 29
• Golden Birthday Explained - when your age matches your birth date

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