OTHER · AGE
Age Calculator
Calculate your exact age in years, months, and days from your date of birth. Handles Feb-29 birthdays and shows your next birthday.
About This Calculator
Enter your date of birth to see your exact age in years, months, and days, plus the total number of days you have lived. Feb-29 birthdays are celebrated on Feb-28 in non-leap years (the convention used in most jurisdictions).
How It Works
The calculator finds the number of completed years since your birthday, then the remaining months and days. All arithmetic uses UTC calendar dates to avoid any daylight saving ambiguity.
The Formula
Age = completed years since birthday. For Feb-29 birthdays in non-leap years, the effective anniversary is Feb-28 (locale-dependent: UK law uses Mar-1, but this calculator defaults to Feb-28). Total days = JDN(today) − JDN(birthday).
Frequently Asked Questions
- What happens to Feb-29 birthdays in non-leap years?
- Most countries treat Feb-28 as the legal birthday in non-leap years. A few (like the UK) use Mar-1. This calculator defaults to Feb-28 — you officially turn another year older on Feb-28.
- Why does my age show as one year less than expected?
- If your birthday hasn't occurred yet this calendar year, you haven't completed that year yet. Age = completed years, not the current year minus birth year.