Mine just turned 14 and throws 68-70 most of the time when trying to throw strikes. About 3 weeks ago we gunned him throwing for velocity and he threw 2 pitches at 70 mph and 8 at 71 mph. In retrospect we think a back problem may have kept him from going over 71 as throwing that percentage of pitches at one's max is unusual. Normally I would have expected to see a couple pitches at about 72 and possibly one at 73 given the number of pitches at 71. He's shut down for the next month or two with the back problem so it'll be interesting to see how quickly he gets his velocity back since we'll have to bring him back very gradually after the rest. We probably won't even let him throw for velocity for quite awhile after he resumes throwing.
I just talked to one of the coaches of the winning pitcher from the LLWS US championship game back in 2004 and he says the kid was gunned throwing consistently at 81 mph in a game recently. We may have to face him at 54' in a tournament over Thanksgiving weekend. I don't believe he turns 14 for another week or two.