The americans don't look as young, to me. They have breasts at least! More mature faces, more mature voices! Yes, they're very muscular and thin, but they're professional athletes. They are much more developed than in 1996: The Americans were shorter, lighter, and had very high voices. Do a search for the Olympics girls team from then - there is an interview of one of them- listen to how immature her voice is! Its like she has never been allowed to go through normal puberty.