For the sake of discussion, which age would you want to pause at? 16, 24 for insurance reasons?
16 is way too young. Assuming brain development is paused at that age, society would descend into some kind of Lord of the Flies hellscape.
Yes, humans can be violent but we are obviously more predisposed to be cooperative otherwise we would have never made it this far as a species. You can't put 10,000 unrelated members of any other species in one place and not expect chaos, with humans it's no problem as long as everyone involved has food in their bellies and the promise of going home after a few hours. That's our real defining trait, getting along with each other, our intelligence wouldn't do a lick of good if we didn't have that.