Enter two birth dates to find the exact age gap between two people in years, months and days, and see who's older.
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This tool finds the calendar difference between two birth dates by counting complete years, then complete months within the remaining time, then the remaining days, the same method used to calculate a single person's age. The order of the two dates doesn't matter, the calculator automatically identifies which date is earlier and reports who's older.
The Age Calculator finds how old one person is today (or on a chosen date) from a single birth date. This tool instead compares two different birth dates directly to find the gap between them, useful for comparing siblings, partners, or any two people's ages.
Comparing a birth date of May 10, 1990 against November 20, 1985 gives an age gap of 4 years, 5 months, 20 days (1,632 total days apart), with the person born in 1985 identified as the older of the two, even though a naive '1990 − 1985 = 5 years' subtraction would overstate the gap by not accounting for exactly where each birthday falls in the calendar year.
Subtracting birth years directly as a shortcut, as the worked example shows, this ignores where each birthday falls in the year and can overstate or understate the true gap by a year.
Assuming the 'Older' result refers to birth date order rather than actual age, the person born earlier (further in the past) is always the older one, regardless of which input field their birth date was entered into.
Entering the same birth date for both people and expecting an error, this is valid input, correctly reported as a zero age gap ('Same date') rather than treated as a mistake.
No, enter the two birth dates in either order. The calculator automatically determines which person is older.
Yes, enter any two birth dates to see the exact gap between them, real or historical.
A simple birth-year subtraction doesn't account for whether each person has had their birthday yet this year. This calculator counts complete years, months and days between the two exact dates for an accurate result.
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