A quick look at how this calculator gets your result.
Years, months and days
We count full years first, then full months, and the days left over. Month lengths and leap years are handled automatically.
Age on any date
Change the "Age at the date of" field to find your age on a past or future date, for example on 1 January of next year.
29 February birthdays
If you were born on 29 February, your birthday in a non-leap year is counted on 28 February.