Age Difference Calculator

First person's birth date

Second person's birth date

How this calculator works

Enter two birth dates and this tool finds the exact gap between them in years, months, and days — accounting for different month lengths and leap years, so the result is precise.

This works regardless of which date is earlier; the calculator automatically figures out the older and younger date and shows the difference between them.

Common uses

People use this to compare ages between siblings, partners, friends, or family members, or just out of curiosity when settling a debate about who's older and by how much.