I do know level 5 kids and adults. DS is a level 4, I believe. But 5's are different. DS could easily handle college at 12, but the 5's seem to need college by 12- just can't be happy if their brain isn't being fed at that level. I have a relative who graduated college at 18 or so. He went on to get Multiple advanced degrees in unrelated subjects and is still respected in multiple fields and heading important research projects into his 80's. His brain is just flying all the time, even when just planning dinner or walking around the neighborhood, you can tell he's on a different level.