Life Expectancy of a 40-Year-Old Man

Chance of a 40-year-old man reaching 65 to 100

The odds come straight from the life table's survivors column l(x), which follows 100,000 people from birth:

For planning, the tails matter more than the average. One in four 40-year-old men will live past 89, and one in ten past 93.

Year by year: ages 40 to 50

Out of every 100 men alive at 40, about 96 will still be alive at 50. Over the same decade the one-year death risk grows 1.6-fold, from 0.3% to 0.5%.

Mean vs median: which number to use

The mean (78.6) is the average age at death across all 40-year-old men. The median (81.2) is the age by which half have died and half are still alive.

Here the median (81.2) is higher than the mean (78.6). The difference is 2.6 years. A minority of men who die well before the typical age pull the average down, so more than half of 40-year-old men will actually outlive the mean.

How a 40-year-old man compares

A 40-year-old woman can expect 4.0 more years than a man of the same age (42.6 vs 38.6). At 40, a man's chance of dying within a year is 1.90 times a woman's (0.3% vs 0.2%). The remaining-years gap is 4.0 years, smaller than the 5.3-year gap at birth, because many of the extra male deaths happen before this age and fewer years are left in which a difference can build up.

Five extra years of age do not cost five years of life expectancy. A 45-year-old man has 34.2 years left, 4.4 fewer than at 40, but his expected age at death rises from 78.6 to 79.2. Each year survived removes some of the risk that was built into the earlier average.

Mortality climbs slowly at this age: it takes 13 years for the one-year death probability of men to double, from 0.3% at 40 to 0.6% at 53.

What moves the number

The 38.6-year figure averages every 40-year-old man in the population, from marathon runners to people in hospice care. Large studies link several habits to how far an individual lands above or below that average:

• Several healthy habits together. At 50, men with five low-risk habits (no smoking, healthy BMI, daily activity, moderate alcohol, good diet) were projected to live 37.6 more years vs 25.5 with none (Li et al., Circulation 2018).
• Not smoking, or quitting early. Smokers lose at least a decade of life expectancy; quitting at 35 to 44 regained about 9 years (Jha et al., NEJM 2013).
• Drinking less alcohol. Mortality was lowest at or below about 100 g of alcohol a week; above 350 g a week meant 4 to 5 fewer years at age 40 (Wood et al., Lancet 2018). Even moderate drinking may add risk (CDC).
• Regular physical activity. Meeting the activity guideline was linked to 31% lower mortality than no leisure activity in 661,137 adults (Arem et al., JAMA Intern Med 2015). The CDC guideline is 150 moderate minutes a week (CDC).
• Staying socially connected. Stronger social relationships were linked to 50% higher odds of survival across 148 studies (Holt-Lunstad et al., PLoS Med 2010). The NIA lists ways to stay connected (NIA).

These are associations from observational studies. They show how much outcomes differ between groups, not a guaranteed gain for any one person.

Nearby ages

• 30-year-old man
• 35-year-old man
• 45-year-old man
• 50-year-old man
• 40-year-old woman

Full life expectancy table, ages 0 to 100 · Odds of living to 80 · Odds of living to 85 · Odds of living to 90 · Odds of living to 95 · Odds of living to 100

Sources and method

1. Social Security Administration, Office of the Chief Actuary. Actuarial Life Table: 2023 period life table for the Social Security area population, as used in the 2026 Trustees Report. www.ssa.gov/oact/STATS/table4c6.html
2. Li Y, et al. Impact of healthy lifestyle factors on life expectancies in the US population. Circulation. 2018;138(4):345-355. doi.org/10.1161/CIRCULATIONAHA.117.032047
3. Jha P, et al. 21st-century hazards of smoking and benefits of cessation in the United States. N Engl J Med. 2013;368(4):341-350. doi.org/10.1056/NEJMsa1211128
4. Wood AM, et al. Risk thresholds for alcohol consumption: combined analysis of individual-participant data for 599,912 current drinkers in 83 prospective studies. Lancet. 2018;391(10129):1513-1523. doi.org/10.1016/S0140-6736(18)30134-X
5. CDC. About Moderate Alcohol Use. www.cdc.gov/alcohol/about-alcohol-use/moderate-alcohol-use.html
6. Arem H, et al. Leisure time physical activity and mortality: a detailed pooled analysis of the dose-response relationship. JAMA Intern Med. 2015;175(6):959-967. doi.org/10.1001/jamainternmed.2015.0533
7. CDC. Adult Activity: An Overview (physical activity guidelines). www.cdc.gov/physical-activity-basics/guidelines/adults.html
8. Holt-Lunstad J, Smith TB, Layton JB. Social relationships and mortality risk: a meta-analytic review. PLoS Med. 2010;7(7):e1000316. doi.org/10.1371/journal.pmed.1000316
9. National Institute on Aging (NIH). Loneliness and Social Isolation: Tips for Staying Connected. www.nia.nih.gov/health/loneliness-and-social-isolation/loneliness-and-social-isolation-tips-staying-connected

Remaining life expectancy e(x) and survivors l(x) are taken directly from the SSA table (captured 2026-10-19). Survival odds are computed as l(target age) ÷ l(current age). Median ages are interpolated linearly between whole years of the l(x) column. See our methodology for how the personalised calculator builds on these baselines.