According to the Lost Hero, cabin leaders can be chosen for a number of reasons. Drew says that they must be claimed, have completed at least one quest, and if there is a current leader they must challenge them to fight for it. The only reason Drew became leader is because she a tyrant bitch and the former leader of Aphrodite died and she was the next oldest in line and no one challenged her.<br/><br/>So by default, since you are the only child of Zeus right now, you're leader. :P<br/><br/>Abigale is leader by age and experience and being able to tolerate it (look how many people get crammed in her cabin!). Vincent is leader because we decided the former leader left camp for college or a normal life (as normal as possible) and no one has challenged him yet.<br/><br/>Age only comes into play when they are not challenged. A younger demi-god can claim it from them if they win it through a fight.