This is a lazy alternative to {{User age}} that will increment your age for you. Syntax (all variables required):
{{User:Ian Moody/User age auto|year=????|month=??|day=??}}
Example on User:Ian Moody. Adds page to following categories:
- Category:Wikipedians in their (20s, 30s, etc)
[[Category:Date mathematics templates|{{PAGENAME}}]]
[[Category:Templates using ParserFunctions|{{PAGENAME}}]]
[[Category:Age and maturity user templates|Age auto]]