Age Difference Calculator

Find the exact age difference between two people — or any two dates — in years, months and days.

Your age
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Total months
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Total weeks
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Total days
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Days to birthday

Enter a date of birth to see your exact age.

What is age difference?

The age difference between two people is the time between their two dates of birth. It is a fixed number — it never changes as time passes, because both people get older together. Express it in years, months and days for precision, or in total days for very small gaps.

Real-world example

Person A born 12 April 1990 and Person B born 27 November 1993 have a difference of 3 years, 7 months and 15 days. Subtracting birth years alone (1993 − 1990 = 3) misses the months and days and can be off by nearly a year.

Works for events too

The same method finds the gap between any two dates — a company's founding and its IPO, or two historical events. Enter the earlier date first to avoid a negative result.

Frequently asked questions

Measure the time between their two dates of birth, from the earlier to the later, in years, months and days. The calculator does this instantly.

No. The gap between two birth dates is fixed, because both people age at the same rate.

It ignores the months and days. Two people born in different years can be less than a year apart or nearly two years apart depending on their exact dates.

Yes, free and private, with calculations done in your browser.