Delaying from 13 (COPPA) to 16 won't change a thing.
When I was a kid, I was obsessed with Home Alone -- I thought if I had one of those talkboys, I could get some changes made. But in an age where every teen has a recording device in their pocket, I continue to see the kinds of stories that made my blood boil... because when it came time to get the authorities involved they dragged their feet the entire time, if they would even file a report at all, and that inaction is paired with a "zero tolerance" policy on any kind of self defense that sends kids out into the world reluctant to give folks the rightful punch they deserve if they act out (and are entitled to give in most stand your ground states.)
Extending adolescence doesn't solve the root problems here, and conversely, more adults should reread a copy of "1984" and be a little more fearful they're held to the rules and norms they instill on the youth.