Age Difference Calculator
Find the exact age gap between two people by entering both dates of birth below. The difference between the two dates is the age gap.
Enter both dates of birth
How to find the age difference
Put the older person's date of birth as the start date and the younger person's as the end date. The number of days, months and years between them is the age gap.
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.