We can do everything like add muscle and lose fat, yet we can't change our Sim's height. Is it really hard for the game engine to do this, so this is why we don't have this feature? I would love t...
If you wanted realism you'd have to have the teen girls be adult height, but teen boys staying close to child height until they turn young adult! Or until they get to that second half of teen-hood that must be already coded as a hidden trait or something in the game-- the stage when "apply to university" becomes available.