What causes loss of leg hair?

I know this is going to invite some fun. Any way I encourage some insightful analysis. My son noticed it first, and mentioned that I had very little leg hair. I had never noticed it before, but it is quite apparent that the front sides of my lower legs are lacking normal body hair. Chatting with some friends, same age as me, they said they have the same thing, no big deal. But it really bugs me, because there really is no explanation online that is of any credibility. I think it must be the estrogen in foods, the deodorants, shampoos have screwed up my endocrine system. Combined with the fact I am older, and my Testosterone is diminished. I really need a blood test, but fat chance I am going to get one paid for from my insurance company for something they will say is caused by my pants rubbing for a number of years.