This is just crazy. I remember the kids that were the "studs" at my school when they were 13, and most of them weren't even playing sports by the time they were seniors in high school. Some kids develop faster than others, and it gives them a HUGE advantage at sports during this age. I am sure this kid is alot better than your averag,e fully developed 13 year old, but this is beyond crazy none-the-less.