I have done SPL for my neck, underarms and upper lip. I can live with shaving the legs as it is so expensive to do SPL or IPL on the legs. I really don't think my hair has become courser or thicker due to shaving and I have been shaving for 20 year now. So what difference will it make if you start shaving at 10 or 13? I bleached my upper lip until I heard about SPL so I might give her that option when she is old enough.