The following documentation is transcluded from Template:Age/doc:

This template returns the number of full years between two dates, or between a specified date and today (UTC).

UsageEdit

{{ age | year1 | month1 | day1 | year2 | month2 | day2 }}

or

{{ age | year1 | month1 | day1 }}

ExamplesEdit

{{age|1989|7|23|2003|7|14}}

gives

13

{{age|1989|7|23}}

gives

23