Originally Posted by
gugie
13 year old girl is probably not going to grow taller - women mature earlier than men (in many ways!) Women also tend to have longer leg to height ratio. 99% of the BF CVer's that post here are men, so we're used to sizing mentally as if they were men.
Georgena Terry, who is best known for having been a pioneering designer of women-specific bike frames, researched the notion that women tend to have longer legs than men for a given height and found that the evidence says otherwise (see, for example,
this study). Women of average or greater height who are slim usually appear to have longer legs, but that perception is primarily a consequence of their having less muscle mass at the top of the leg than men of the same height.