And of course that makes sense that a kid would be in command of the flagship of the fleet, a ship where there are only 12 like it, that is supposed to be commanded by a very special person, as it takes a very special person to command a starship...not in this universe. Give the kid a job and have him train on the job.
This timeline of Trek is rather silly to be honest.
That's because the makers of these films didn't give a rat's ass about things that make sense in the trek universe. They just wanted younger actors in a movie with lots of Pow Bang Neato FX that would appeal to twenty and thirty somethings with no emotional connection to the original show. And they succeeded.