What are your opinions for finding staff for a server?

From the few servers I've run in the past, my staff almost always comes from either people on my friends list that I knew would be good staff, or players that are regulars and that I know are mature enough to be staff. Also, kids that play a lot and ask to be admins almost always abuse their power and make bad management decisions. So basically anyone older than 15 that knows what they're doing make good staff.