Age Calculator: Years, Months, and Days Between Dates

Age is the elapsed time from a birth date to a reference date—not just subtracting years in your head.

Month and day rollups handle irregular month lengths; tools count whole months then remaining days for clarity.

Use the same calendar system (Gregorian) for both endpoints when comparing legal or eligibility cutoffs.

For official documents, always verify which date authority uses as “today” (local vs UTC).