Well I personally think it all depends on what your PERSONAL thoughts are on what is Too young.

I think that by the time they're 15 or so, most people (At least around here) are mature enough to be sexually active if THEY chose to, or to know about it. I'ld also say that by the time most teens are that age, they know more about sexuality than their parents knew when they had their first kid, anyways, and I don't think thats a bad thing.