i assumed the advantage to having younger girls is that they're lighter (in theory) than older girls, being able to do flips and whatnot more easily than someone more "developed" (ie, more developed breasts, more muscle mass, etc). one article made a point of showing how one of the chinese girls weighs less than 80 lbs, it might've even said she was about 70 lbs. i took that to mean weight, or lack thereof, is a key element to success.
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