Are you kidding full contact...they gotta be wearing head gear. They're bones aren't fully developed and they're going to have serious mental issues growing up.
I'd say 18 is the age to engage in full contact with no head gear. Imagine all the head shots he's absorbing now x that by how many years he'll be in the game.
Fighting wise it's pretty impressive. Reminded me of the scene with Leonidas when he was a kid in 300.
Marcus Aurelius: Tell me again, Maximus, why are we here?
Maximus: For the glory of the Empire, sire.
Baked, not fried... the healthy choice.