Age Difference Calculator
Calculate the age difference between two people.
How to Do It Manually
Calculate age difference by subtracting the younger person's birth year from the older person's. More precise: subtract the birth date.
Age Difference (years) = older birth year − younger birth year (adjust for month/day)
- Enter both birth dates (or birth years if years only).
- Subtract younger from older.
- If older hasn't had a birthday yet this year and younger has, subtract 1.
Frequently Asked Questions
Does age difference change?
No, the year difference stays constant. The month/day difference shifts by 1 when one passes their birthday first.