Then the 'adult age' should be 21 too, because at 18 you're not a grownup yet. And it seems that European children grow faster because they can drink at 18 or l

Then the 'adult age' should be 21 too, because at 18 you're not a grownup yet. And it seems that European children grow faster because they can drink at 18 or less (http://en.wikipedia.org/wiki/Drinking_age http://en.wikipedia.org/wiki/Drinking_age). Or maybe brain research only exists in the US.