The majority of online hackers may be kids, but I believe the majority of hackers in general are all ages. The difference is that those who are mature do not bring their hacks online to ruin game integrity for the masses. I can respect those hackers, because they're doing what they want to do but have restraint and respect for those of us who want to keep things legitimate and competitive.
That being said, the kids using these hacks online used guides & programs created by mature PS3 modders, or gamesaves edited by these people. If the hackers were to group together and stop explicit use of these hacks to exploit online use of games, they would essentially stop all issues we're experiencing. The difficulty would be explaining this to them, and convince them to stop making public updates for their modding programs - or to only share with people who will be responsible. It might not be possible.