Comparison
Age Difference Calculator
Compare two birth dates in years, months and days and see who is older.
Open tool →Comparison
Combined Age Milestone Calculator
Find when your combined completed ages reach or pass a chosen milestone.
1
Your dates
On this deviceYour dates are remembered here for 30 days. No account needed.
2
Your story in numbers
Every date has a story.
Enter your dates to discover your result and the next dates worth keeping.
Understanding your result
The sum uses completed years, not decimal ages. The result is the first date when both people have been born and the sum reaches or exceeds the target. If birthdays make the total jump over a number, the tool says so.
See a worked example
Illustrative example, as of September 13, 2026.
- Date of birth
- 1991-05-16
- Person B’s birth date
- 1994-08-22
- Years
- 100
May 16, 2043
Are my dates sent to a server?
Calculations run in your browser. Your dates stay on this device unless you choose to include them in a sharing link or image. “Clear my dates” removes them from local storage.