Aaron's father, John Brooks, coaches his son in wrestling and says that his son's workouts consist of light dumbbells and "a lot of push-ups."
Aaron will compete in a sanctioned powerlifting event in New Jersey in June, and his goal is to break the record for 8 and 9-year-olds in his weight class (kids who weigh less than 88 pounds). The current record is 77 pounds, and Aaron says he can do more than 90, so he's got a good chance of breaking the record.
And as long as Aaron will be supervised and have a good spotter, I say more power to him. I suppose there are injury risks associated with being a child weightlifter, but then again there are plenty of health risks associated with being a child who sits around watching TV all day. There are worse things than teaching young kids to try to push themselves physically.