Understanding your calculation
Method, example and limitations
How the calculation works
Calendar age counts completed years, then remaining calendar months and days between the birth date and the selected reference date.
Example to check
A person born on June 15, 2000 reaches age 25 on June 15, 2025; on June 14 they are still 24.
Before using the result
Use the correct reference date and local calendar date. Leap-day birthdays and legal age rules can have jurisdiction-specific treatment.