Kadasbrass Loreweaver wrote:
14 should be fine. As long as his goal isn't to try to get everyone killed, try to pick a fight with other players, or try to grapple a faction leader.
Since he is your brother, it will be your job to mentor him so he becomes an example of excellence in the Society, or a shining example of murderhobodom.
I plan on going over the PFS rules so he doesn't break the special rules. He has played Pathfinder before and he has enough maturity to take the game seriously, understand the rules and have fun with roleplaying. I know he wouldn't try to kill his own allies.