Age Calculator Online
Calculate your exact age in years, months, and days. Perfect for official forms, school admissions, or tracking life milestones.
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Age Calculator — Exact Age in Years, Months, Days, Hours, and Seconds
Age calculation is deceptively complex because calendar months have unequal lengths, leap years exist, and time zones can shift the boundary between days. The simple subtraction of birth year from current year overstates age for people whose birthday has not yet occurred this year. The age calculator performs day-exact calculation using the Gregorian calendar, correctly handling leap year birthdays (February 29 birthdays are treated as March 1 in non-leap years for most legal and age purposes) and timezone-aware date boundaries.
Age in specific units serves different purposes. Legal age thresholds (voting at 18, retirement at 65) require year-accurate calculation. Medical gestational and developmental ages are measured in weeks and days. Scientific calculations of half-life and radioactive decay use decimal years. Sports eligibility cutoff dates use day-exact age. The age calculator reports age simultaneously in years/months/days, total days, total hours, and total seconds so the appropriate unit is immediately available for any context.
Age difference between two people or the age of a historical object from a known creation date uses the same underlying calculation. The Shroud of Turin, carbon-dated to 1260-1390 CE, is between 636 and 766 years old. A bond issued on March 15, 2018 with a 10-year maturity reaches full term on March 15, 2028 — its current age as of today determines whether it has reached maturity or how much time remains. The calculator accepts two arbitrary dates and computes the interval in all units for any date-difference application.