How is the exact age difference calculated?

The tool computes the absolute difference between the two birth dates, then converts it into years (accounting for leap years), remaining months, and remaining days using calendar-accurate arithmetic.

What does 'Earth orbits' mean?

One Earth orbit is one tropical year (365.24219 days). The number of orbits between the two birth dates is the total day difference divided by this value — a fun way to visualise the time span.

Does it handle leap years?

Yes. The calculation uses JavaScript's Date object which correctly accounts for leap years when counting calendar months and days between dates.

Can I use future dates?

Yes. The tool works with any two valid dates, past or future. It simply calculates the absolute difference between them.

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Age Difference Calculator

Calculate the exact age difference between two people

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Enter two birth dates to find the precise age gap in years, months, and days — plus who is older and by how much. Get the difference expressed as total days, weeks, and months. Enjoy fun stats like the difference in hours, minutes, and seconds, plus how many times the Earth completed an orbit around the Sun between the two birth dates.

使い方

1 Enter the birth date of the first person in the 'Person 1' field.
2 Enter the birth date of the second person in the 'Person 2' field.
3 The results update instantly showing who is older and by exactly how much.
4 Scroll down to see the fun stats like hours, minutes, and Earth orbits apart.

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