Compute exact age in years, months, and days from a date of birth, with extras for calendar context.
Age math follows Gregorian calendar rules, including February 29 in leap years. People born on Feb 29 are typically treated using common civil conventions for non-leap anniversaries.
Some tools count only whole years, ignore time zones, or use average month lengths. This calculator emphasizes calendar-accurate year/month/day breakdowns.
Dates stay in your browser for on-page history. Clearing site data or using a private window removes those local logs.