Male Baldness Info

Why is it considered socially acceptable for men to be judged by to opposite sex based on baldness and/or lack of height (both of which are unpreventable), but one is not allowed to judge a woman based on her weight (which it TOTALLY preventable)?

I have that traditional male pattern baldness. The bald spot is on the backside of my head. I am not completely bald. I do have a good amount of hair. As I get older though (age 47), I feel like it is getting worse. Should I see someone that specializes in hair improvement for men?