Age Calculator
Age Difference Calculator
Enter both dates of birth below to get the exact age gap in years, months and days — plus each person's current age and who is older.
Enter both dates of birth
How to find the age difference
Enter each person's date of birth — the order doesn't matter. The calculator works out who is older and shows the gap between the two birthdays in years, months and days.
Example: one person born 10 May 1990 and another born 22 November 1993 are 3 years, 6 months and 12 days apart.
The age gap never changes
Because both people get older at the same rate, the difference between their ages is constant over their whole lives — it is fixed the moment the younger one is born. So you can calculate it once from the two birth dates and it stays the same.
Common uses
- The age gap between partners in a relationship.
- The gap between siblings or twins (sometimes just minutes).
- Comparing classmates against a school year cutoff.
- Working out the gap between two historical figures or events.
Frequently asked questions
Does the age difference between two people change over time?
No. Both people age at the same rate, so the gap is fixed for life. Calculating it once from the two birth dates is enough.
How do I calculate the age gap between two birthdays?
Enter the earlier birth date as the start and the later one as the end. The resulting span in years, months and days is the age difference.