Life Expectancy Calculator

Life expectancy estimation starts with a population baseline for your sex, adjusts it for the age you have already reached, then applies adjustments for lifestyle factors drawn from large longitudinal studies.

Base life expectancy at birth:

• Male: 76 years
• Female: 81 years

These are the US figures for 2023 from the National Center for Health Statistics, 75.8 and 81.1, rounded. Western Europe and Japan run two to four years higher.

The survivorship adjustment, which most calculators skip. Life expectancy at birth is an average across everyone born, including those who die young. Having already reached 60 means you have avoided all of that, so your expected age at death is higher than the figure for a newborn.
This calculator adds age² / 500 years for men and age² / 700 for women, simple curves that land within a year or two of the US life tables at 65 and 85. Women get the gentler curve because fewer of them die young in the first place, so surviving to 65 tells you less. At 65 that adds 8.5 years for a man and 6.0 for a woman.

Estimated age at death = Base + survivorship + the adjustments below

Every adjustment this calculator applies. These are the exact values in the code, in years, against a person with average habits:

This page used to run larger numbers, up to +5 for exercise and +3 for a whole-foods diet, so that the best and worst answers sat 40 years apart. That is far more than any cohort has seen.
The best real comparison is the Harvard study by Li and colleagues (2018): from age 50, women with all five low-risk habits (never smoking, a healthy weight, half an hour a day of exercise, moderate alcohol and a good diet) lived about 14 years longer than women with none of them, and men about 12. Habits overlap, because people who smoke also tend to exercise less, so adding the rows here still overstates the gap between the extremes.

Note that never smoking scores zero rather than a bonus. Non-smoking is the baseline the rest of the table is measured against, and smoking is the penalty. Written the other way round, as many sources do, “non-smokers live 10 years longer” says exactly the same thing.

Worked example:

A 35-year-old woman who exercises 4 times a week, has never smoked, is a healthy weight, eats mostly whole foods, sleeps 7 to 8 hours, and has close friends and family:

• Base for a woman: 81
• Survivorship at 35: 35² / 700 = +1.75
• Exercise +1, smoking 0, BMI +1, diet +2, sleep +1, social +2 = +7
• Estimated age at death: 81 + 1.75 + 7 ≈ 90, or about 55 more years

That is the top of what this model gives a 35-year-old woman, for someone doing every single thing right. Treat the direction as meaningful and the exact figure as a rough one.

Important context: This is a statistical estimate built from population averages, not a medical prediction. Genetics, access to healthcare, geography, and plain luck matter enormously and none of them are in the arithmetic. The value here is comparative: change one dropdown and watch what it does. That comparison is honest even when the absolute number is not.