How exact age is counted
We count full calendar years first, then full months, then the remaining days — the same way people say “25 years, 3 months and 10 days”. Total days use the actual calendar, including leap years.
If you were born on February 29, your birthday in non-leap years is shown as March 1.
Frequently asked questions
How many days old am I?
The second line shows the total days between your birth date and the chosen date.
Last reviewed 2026-10-14.