Yeah, it's sad how it's normally trial and failure that actually gets us to be able to stand and protect ourselves. I had an aunt that unfortunately had her life ruined by a guy waaay older than her. She was 13 when he (24) made his move on her and later they got married. He had a problem whenever his teenage wifey would spend the day in bed rather than get up when he did and cook and clean for him. The result was domestic abuse, screaming and divorce. My aunt learned the hard way that since no one would help her she had to get out on her own.
But yeah, personal stories aside; it is ludicrous how they're pitting kids to thinking that older guys are cool despite that a healthy-minded 20 year old wouldn't dream of touching a kid still in her training bra. Only that if he's got a car, a good wardrobe, and looks physically advanced (no acne, and a fully developed mesomorph anatomy :P) he's perfect. Like you said, never mind on the actual important things.
But yeah, I'd love to sit down with the plot writers and try to get out from them why they write those things knowing what effect it gets out. I even want to know if they were all men or something. :/