Calculate Your Exact Chronological Age Calculate precise chronological age with optional birth time for exact age in years, months, days.

The chronological age calculation uses calendar arithmetic, comparing the birth date to the current date component by component. The year difference is adjusted down by one if the current month/day hasn't reached the birth month/day yet. Month and day remainders use the same borrowing logic as the standard age calculator. The decimal age divides total days by 365.25 (the average Gregorian year length including leap years) and rounds to 2 decimal places. When birth time is enabled, the reference changes from midnight to the specific birth time, and all total-unit calculations use the more precise millisecond difference. Generation classification uses standard year ranges: Silent Generation (1928-1945), Baby Boomers (1946-1964), Gen X (1965-1980), Millennials (1981-1996), Gen Z (1997-2012), Gen Alpha (2013+).