A.J.
The right age is when she feels bad about the leg hair and wants to shave. I had hairy legs (pale skin, dark hair) for a while before my mom would let me shave for whatever reasons she had. I was SO MISERABLE! I suddenly hated gymnastics-which I was very good at-just because I didn't want to have hairy legs for all the world to see. I think she finally caved in and let me when I was about 11 and was playing sick to get out of anything that showed my legs-even in the hot hot summer...I didn't want to go to the pool...
I will never make my girls shave their legs or even suggest it, but the MINUTE they want to do it, they'll be able to.