text: I don't want to burst your bubble, but zero to none.  Girls who start when they are 2 and 3 have little chance of making it big.\nAlso, at 16 you are probably beginning to "develop" if you know what I mean, and that is a big no-no for girls gymnastics.\nNow, as far as just being "good" and by good you mean decent, but not Olympic-quality, then you have a great chance, go for it.