A word from us before the numbers. We're calcaholics — we love stats, facts, and data; it's the whole reason this site exists. But we'll admit something freely: raw data can be cold, and raw numbers never tell the whole story of a person or a life. If you've found your way here, there's a decent chance you're working through some genuinely hard decisions — for yourself, or for someone you love. Sometimes doing right by ourselves and our families means looking honestly at population averages and actuarial tables, even when that's not an easy thing to do. So take these figures for what they are — honest, well-sourced planning inputs — and take whatever time you need with them. The math will wait.
How this calculator works
It looks your age and sex up in the Social Security Administration's 2022 period life table (the actuarial table published with the 2025 Trustees Report) and reports the average remaining life expectancy — the mean number of additional years for people that age, if 2022's mortality rates held for the rest of their lives. A "period" table is a snapshot: it's built from millions of actual U.S. death records in a single year, which makes it extremely reliable about populations and deliberately silent about individuals. The same table's survivorship column lets us go one step beyond the average, and that step is the whole point of this page: the ages that roughly 25% and 10% of people your age and sex will reach.
Why those percentiles matter more than the average: about half of people outlive the average. A retirement plan built to the average life expectancy is a coin flip with your solvency — heads you're fine, tails you're 88 with money designed to run out at 82. Planning to the 25th-percentile age instead means only about 1 in 4 people in your cohort would outlive the plan, which is why our retirement withdrawal calculator and Social Security break-even calculator default to planning ages in the 85–90 range rather than to averages.
The formula
e(x) is read directly from the SSA table for your age and sex; ℓ(x) is the table's survivorship column — of 100,000 births, how many are still alive at each exact age. The percentile ages interpolate linearly between whole ages and are rounded to the nearest year. The 10th-percentile age uses the same formula with 0.10.
Worked example
A 65-year-old man: the 2022 SSA table gives e(65) = 17.48 more years, so the average age reached is 65 + 17.48 ≈ age 82.
The survivorship column shows 77,402 of 100,000 male births alive at 65. A quarter of that is 19,351 — crossed between ages 89 and 90 — so about 1 in 4 reach roughly age 89. A tenth is 7,740, crossed between 93 and 94, so about 1 in 10 reach roughly age 94. His money should be planned to at least age 89, not to 82.
Why we don't ask about smoking, diet, or exercise
Plenty of life-expectancy quizzes ask a dozen lifestyle questions and hand back an oddly specific number. We refuse to, on principle: bolting a smoking checkbox and an exercise slider onto a population table doesn't personalize the estimate — it manufactures fake precision, because the honest error bars on any individual's lifespan span decades either way. Real personalized estimates come from physicians and underwriting actuaries working with full medical histories, and even theirs carry wide uncertainty. A tool that admits it's reporting population averages will serve your retirement planning better than one that pretends three checkboxes changed your fate. The averages here move for exactly two things, because the source table is built on exactly two things: age and sex.
Using a planning age well
The planning age is where this page hands off to arithmetic that can actually help you. Feed it to the retirement withdrawal calculator to see whether your savings last that long; feed it to the Social Security break-even calculator, where a longer planning horizon generally strengthens the case for claiming later; and if longevity runs in your family, remember the percentile rows — the 10th-percentile age is not a tail risk exotic enough to ignore when one in ten of your cohort reaches it. One more honest note: period tables slightly understate the outlook for younger people, because they freeze today's mortality rates and medicine tends to improve. That's one more reason to round your planning age up, never down.