Ah if you look at it from the perspective of doing research or other deep intellectual work by 22, I can see your point. Certainly if that is the peak of human mental capability (not something I can argue for or against but I'll take it as true) you ideally would pursue a focused education up to that point that allows you to dive deep into a challenging problem. IMO this is different from wisdom however, and in fact pursuing the variety of experiences and interactions with others that you need to build wisdom will distract from the focus on your research subject.