Birth control serves another purpose...one that can be even more useful in girls and young women. It regulates the menstrual cycle. For someone who literally never knew when it would hit, anywhere from a little under 2 weeks to over 6, being put on the Pill at 14 was a Godsend for me. In the 10 years that I've been on it I've never had more than 24 hours variation...no embarrassing surprises, no days of misery.
If any daughters I ever have start having the same issues I did, I wouldn't hesitate to see about having them put on it. I also wouldn't hesitate to slap them so hard their heads rang if I caught them slutting around like an animal in heat :-)
My daughter's been taking hormone pills (i.e., birth control pills) since she was 13 or 14, because of "hormone problems" (debilitating cramps, extreme behavioral episodes). I'm sure she would agree with you.
I decided to take a look at the Full U.S. Prescribing Information (PDF) for the Ortho patch. The indications say, "ORTHO EVRA is indicated for the prevention of pregnancy in women who elect to use a transdermal patch as a method of contraception." They don't define who "women" are, but further on they mention three clinical trials performed on 18-45 year olds. They leave it up to the physician to decide possible safety in younger or older women.