Concussions are a cumulative problem in football, and I suppose in some other sports, and there has been much written about state of the art helmets, or what is not so good about the state of the art. I have no idea about statistics and peewee football, but what Rockhead said made sense re injuries getting more serious with weight and speed in older kids.
I remember that talk about injuries in that thread too, boomer, and also remember that at least in a few places there is new emphasis on some exercizes to ward some of the injuries off. I that was mostly about knees.. and mostly about older children and adults, re the problems involved in knee weakness for even the seemingly strongest people. (I can see paying attention to the age 13 and bone plate thing).
I liked watching football in grammar school - our team was competitive in the chicago elementary school catholic league, whatever they called it. Those guys are all a half century older now, if they're still, eh, kicking. Wonder how their knees and brains held up..