> I don't know any parents who would want their child to stop playing at 7 years old. Parents don't decide what happens to the kids at school though. > We can

> I don't know any parents who would want their child to stop playing at 7 years old. Parents don't decide what happens to the kids at school though. > We can socially change much faster than we can biologically evolve. If the genes were always there but they died constantly 200 years ago it just meant that we no longer cull those people early, and after a couple of such generations we now have them around. Early puberty is still not common, it just exists, that makes it more likely to be biological than social, if the social changes did it then early puberty would be the norm today rather than a very rare exception.