@FairyQueen, I see what you mean there, but religion isn't like profession, isn't like favorite color or fashion style, even isn't like love. When you find your true religion, you just never let it go.
People ask me "so, you made an oath, can you ever stop doing that, can you leave?" and I say "No. And even if I could, I never would."
Oh, but I do agree that there will be some that go for things just for the flock. In my opinion that is why initiation into such covens as and such should probably be limited to people who pass some psychological tests - because age usually isn't good enough of characteristic to make sure someone is serious. If there was a psychological test of sorts, you could see how good the person knows himself and by that, judge if he is ready for commitment like this.
Because how can someone get ready to know the world, if he doesn't know himself before that?