I actually have to admit that as a petite woman (when I'm not overweight!) I'm quite aware of the fact that as I get healthier, I will most likely be viewed as a weak, young woman. I'm 30 but even 70 lbs overweight people say I look 21-25. When I was thinner, I was often asked if I was old enough to be doing my job, driving, drinking, etc.
Thats honestly something I'm a little concerned about... My weight has been my buffer.