Honestly, I will take older teens(16 up) seriously, but only if what they say is smart.
And high school was hell for me. Only guys, most of them either snobby rich kids or sports jocks. It sucked. Being the socially awkward, aspergers syndrome, slightly smarter than usual but also ADD ridden, wussy, non-violent nerd kind of kid........I was bullied non-stop. Even by people younger than me.
And of course, my main tormentor was the NEPHEW of the VP of discipline. Meaning that no matter how many detentions he got (for bullying and being a general dick), he would never be expelled. I may have escaped being beaten up, but I did get kicked, tackled into walls/the floor, soccer balls kicked at my face, and dragged across the gym locker room floors in my underwear. >_<
It took me 5 years of awesome college and finding the most awesome girlfriend ever (also my first) to reach the levels of self-esteem that most people enjoy naturally. But I still seethe at the memories of that high school. And I'm sure I've repressed most of the worst memories.
If you live in Montreal, Quebec, Canada...DO NOT SEND YOUR KIDS TO LOYOLA HIGH SCHOOL. Unless they're good at sports. Then they'll do OK. If your kid is sensitive or not physically strong, the school's no bullying allowed policy is (or at least WAS while I was there) USELESS.