Age

Package: DATETIME_PACKAGE. Registered by createEngine(); for a slimmer engine, register it explicitly (see choosing packages).

Age is how many whole calendar years have passed since a birth date. Solve counts them the way a person does, walking the calendar, so the answer is right across leap years, and it can give the full years, months and days instead of a single count.

Whole calendar years from a birth date, reckoned at now unless an on <date> gives another reference. in years, months and days asks for the full breakdown instead of a single count.

age of 15/06/1990 on 25/12/2030 // 40 years
age of 15/06/1990 on 26/08/2026 in years, months and days // 36 years, 2 months, 11 days

Without on, the age is reckoned at now. The answer shown is for 11 March 2026, the fixed date these pages are checked against, and the notepad gives today’s.

age of 15/06/1990 // 35 years

The count walks the calendar rather than dividing a fixed-length span, so the leap cases are right: a 29 February birth is a year older on 1 March in a non-leap year, where a 365-day division would drift. This is the calendar-aware counterpart of years between, which divides and is the right tool for a rough span.