Ungrateful infidel, you should be thankful to Master Umakoshi.It's not like the original character designs looked their age to begin with. Seiya was supposed to be what, thirteen?
It's not their ages that bother me, it's that Umakoshi seems to have taken the "cloth" part a little too literally. Why does everyone look like they popped their shirt collars bro-style when it's supposed to be armor?