Thread:Project:Support desk/How can I calculate my age using an expression? (for my user page)

Hi, My user page I tried to make this a proper interwiki link, but my en:User:3ICE attempt failed in the preview states: But that is because I last edited it about 2 years ago.
 * I'm 19.

I would like to replace my age with a code snippet, to avoid making a new edit every year just to update it. (I do not wish to remove my age from my user page.)

How would I code  in MediaWiki's ParserFunctions Expr format? (Or some other programming language available on mediawiki) The help article did not cover subtracting dates, and googling around did not turn up anything I could use either. (I know, I probably didn't look hard enough.)

I study programming, but this problem has me stumped. Please help, 3ICE (talk) 21:05, 2 March 2012 (UTC)

p.s.: The Show Preview button does not cause the Subject to be previewed, I can only see my message's body.

p.p.s.: Some people made this page ridiculously wide, by posting URLs inside  tags.