Age Difference Calculator
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Compare two birth dates to see who is older and the exact gap in years, months, and days.
Two birth dates
Age difference
5y 2m 5d
Person A is older
- Total days (signed)
- 1,890
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Age gap between two people
The age difference between two people is the calendar span from the older birth date to the younger one — reported as years, months, and days, not just a single number of years.
This calculator handles leap years and varying month lengths by walking the calendar, the same way exact age is computed. A negative sign means the first birth date entered belongs to the younger person.
Example: Person A born January 10, 1990 and Person B born March 15, 1995 → B is younger by 5 years, 2 months, and 5 days. Useful for siblings, couples, and eligibility checks.
Common questions
Which person should I enter first?
Order does not change the gap size — only the sign. Positive result means Person A is older; negative means Person B is older.
Does this count partial years?
Yes. The result shows full years plus remaining months and days — not a decimal like 5.17 years.
Can I use future birth dates?
Both dates must be valid calendar dates. Future birth dates produce a gap but are not meaningful for real people.