title: I'm a 72-year-old male, and I feel like I'm losing interest in sex. Should I have my testosterone levels tested?
mesh_terms: D000368:Aged; D000375:Aging / Q000502:physiology*; D006801:Humans; D007989:Libido / Q000502:physiology*; D008297:Male; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone