To a certain extent I think some of this stuff is culturally conditioned, albeit I realize not absolutely. On the one hand we shouldn't call our ancestors pedophiles or rapists because they did something that isn't per se against the natural law, just because its not exactly in line with our current cultural norms. Someone asked me recently if King David was a pedophile because of Abishag. I said no. I said that's anachronistic.
On the other hand, I don't feel obliged to be comfortable with the idea of someone my age or older (24 soon to be 25 for what its worth) with a girl who's around 15, in today's culture and society, where that girl would probably be fresh out of middle school, just because men who did that in the past weren't pedophiles. Its still weird in this place and time, and I'd think ill of the kind of man who would seek that kind of relationship out.
You can't just manufacture the kind of maturity that existed in the past, for better or worse most people grow up later now.