I am probably experiencing decreased testosterone due to being male and nearly 50. Or maybe it is something else.

So I realize I feel mildly horny, but I don't care. I'm not in a relationship. In the past I masturbated as needed to relieve the frustration. Now I just don't care. I just don't have the energy or enthusiasm to masturbate. I don't know if I'm less horny or if I'm just depressed or something. I don't know if my hormones are decreasing or what.

Anybody else gone through this stage of life? Maybe you can give me some clues. Am I tired because my testosterone is low?