Life Expectancy Calculator
How long will I live? See the average remaining years and expected age for people of your age, sex and country, straight from the WHO 2023 life tables.
United States · both sexes · age 40
Years ahead, on average
40.7 years
- Expected age
- 80.7
- Life expectancy at birth
- 78.5
- World average at this age
- 38.3 years ahead
WHO 2023 life table: United States, both sexes. Women at this age: 42.4 years ahead; men: 39.0.
For entertainment and statistics only – not a medical prediction.
Years ahead by age: United States, both sexes
| Age | Years ahead (average) | Expected age |
|---|---|---|
| 0 | 78.5 | 78.5 |
| 1 | 77.9 | 78.9 |
| 5 | 74.0 | 79.0 |
| 10 | 69.0 | 79.0 |
| 15 | 64.1 | 79.1 |
| 20 | 59.3 | 79.3 |
| 25 | 54.5 | 79.5 |
| 30 | 49.9 | 79.9 |
| 35 | 45.3 | 80.3 |
| 40 | 40.7 | 80.7 |
| 45 | 36.2 | 81.2 |
| 50 | 31.7 | 81.7 |
| 55 | 27.4 | 82.4 |
| 60 | 23.3 | 83.3 |
| 65 | 19.4 | 84.4 |
| 70 | 15.8 | 85.8 |
| 75 | 12.3 | 87.3 |
| 80 | 9.1 | 89.1 |
| 85+ | 6.3 | 91.3 |
Source: WHO Global Health Observatory, life tables 2023 (indicator “ex – expectation of life at age x”). Your exact age is interpolated between these rows.
What life expectancy really means
Life expectancy is the average number of years a group of people would live if the chances at every age in one year applied for their whole lives. Demographers call this a period life table. It is the standard way countries and the WHO describe how long people live, and it is what this calculator shows. It is a summary of a population, not a forecast for one person.
In 2023, life expectancy at birth in the United States was 78.5 years: 80.9 for women and 76.2 for men. The world average was 73.3. The highest in the WHO data was Japan at 83.9 years; see the full list of life expectancy by country.
Life expectancy at birth vs. at your age
The number you hear in the news is life expectancy at birth. It includes the risks of infancy, childhood and young adulthood, which pull the average down. Once you are 40, 60 or 80, you have already come through those risks, so your expected total age is higher than the at-birth number. In the table above you can see this: the expected age climbs in every row. That is also why this calculator asks for your age.
How to use this calculator
Enter your age in whole years, choose female, male or the average of both, and pick your country. The result updates as you type. You will see the average remaining years for people like you, the expected age that adds up to, and how that compares with the world average and with the other sex. Prefer an exact date and a ticking clock? Use the life expectancy clock. Want it in days or weeks? Try days lived or life in weeks.
What the number cannot tell you
The WHO tables know your age, sex and country, nothing else. They cannot see your health, your family history or how you live, and they do not account for future medical progress. Use the result as a statistical reference point. For ideas on adding healthy years, ExtendLife.app collects practical, evidence-based habits.
Frequently asked questions
How long will I live?
Nobody can tell you that, but the average is a useful reference. In the United States, a 40-year-old has on average 40.7 more years ahead, according to the WHO 2023 life table. Enter your own age, sex and country above to see the figure for people like you.
What is the difference between life expectancy at birth and at my age?
Life expectancy at birth averages over everyone born, including the risks of infancy and childhood. Once you have reached a certain age, you have already come through those early risks, so your expected total age is higher. This calculator always uses the remaining life expectancy for your current age.
Why is life expectancy for women higher?
In 184 of the 185 countries in the WHO data, women live longer than men on average. The gap reflects a mix of biology and behavior, such as higher smoking, alcohol use and accident rates among men.
Which year is the data from?
The calculator uses the WHO Global Health Observatory life tables for 2023, the latest year available when the site was built. The source links are on the How it works page.