Pick how you'd like to keep your clock.
A guest clock lives in this browser only — it survives reloads, but not a cleared cookie or a different device. Sign in with Google to carry your settings everywhere. Either way, the only thing stored is your sex, birth date, and a few toggles.
The clock starts from the SSA 2023 life table — the average number of years a person your age and sex has left — and reads smoothly between birthdays. It shows those remaining years directly, so it falls a touch slower than real time (about 0.84 of a second per second at 51), while your expected end-date drifts later at the leftover ~0.16. The two always add up to one second. The lifestyle nudges are rough rules of thumb, not a medical estimate. Source: ssa.gov life table.