How this age calculator works
Enter a date of birth. The calculator subtracts that year from the current year, then checks whether the birthday has already happened. If it has not, it subtracts one. The result is completed years as of today.
A person born on 1 January 2000 is 26 on 7 October 2026. A person born on 15 December 2000 is still 25 on that same day, because December has not arrived yet.