Age Difference Calculator
Calculate the exact age difference between two people in years, months and days.
What is the Age Difference Calculator?
This tool calculates the exact gap between two people's ages in years, months and days — from their two birth dates, not from today's date, so it works for comparing anyone, living or historical.
How to use it
- Enter both people's birth dates.
- See the age difference broken down into years, months and days, plus the total number of days apart.
The calculation correctly handles different month lengths and leap years rather than assuming every month is 30 days or every year is exactly 365.
Want the "why" behind this tool? Read Why Calculating an Age Difference Isn't Just Subtracting Birth Years.