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If you ask me, there are three forces at work here:
- higher age is correlated to more practice (up to a point, then it decreases) which is correlated to better times
- more height is correlated to bigger hands which is correlated to better times (up to a point)
- female gender seems to be correlated with less practice which is correlated to worse times - I don't think women have any less potential to be fast, just that they statistically tend to practice less
So basically I think you'll find some correlations, but the age/height/gender variables themselves aren't directly to blame. You may even get some weird results that only exist because of the bias of choosing people who regularly post on a cubing forum.