Lilduders wrote: I wouldn't count yourself out based on age :P
Some of the staff right now are or were 14 while being a staff member. The best you can do is meet the requirements and try to be helpful, as that's what really counts.
I'm 14 and I'm staff so I'll say that age does not affect staff position, it's based on how well you work on wiki both with other users, your activity, maturity and your edits in some ways. As Lil already said admins are chosen by the current admins and I do not believe any admin positions are currently open.