I in my time have had several 15yr olds, and have one of that age right now, She is generaly a sensible, inteligent girl, who knows right from wrong, she babysits, but only over the road from me, and helps out as much as she can.
That said, yes she is going to screw up at times, and has done. She was with a group of friends all going to the local youth club, and a lift home was arranged, all lies, she was down the park with a bottle of cider, her friend was carted of in an ambulance, and Dd had a huge wake up call, thank god her friend was ok, but I spent a good few days not only drumming in the underage drinking, but the risks to herself and what could happen if someone was of the mind to take advantage of her in that position.
They are young Adults, and should be treated as such, they have to learn from their mistakes, but still need a guiding hand from Mum and Dad.
She is the 6th 15 yr old I have pulled my hair out over nurtured, 1 more to go , they have all turned out as pretty descent people, so I can't have gone far wrong, all we can do is guide and love, and allow them to spread their wings and hopefully fly home.