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Quick answers.

›How is age calculated?

We compute the difference between today (or your chosen date) and the date of birth, accounting for leap years and varying month lengths.

›Why does my age in days seem off by 1?

Edge cases around midnight and the exact moment you were born can shift the result by a day. We use UTC midnight for both dates.

›Can I calculate age on a future date?

Yes — pick any date for the 'as of' field. Useful for figuring out 'how old will I be on my anniversary'.

›What's the oldest verified age?

Jeanne Calment, 122 years 164 days (1875-1997). For perspective, that's about 44,724 days.

›Is the calculator free?

Yes — free, no signup, runs in your browser. Birth dates never leave your device.