andropause
an·dro·pause / ˈændroˌpɔz ; ˈændrəʊpɔ:z /noun U
1. the period in a man's life when the amount of testosterone in his body begins to reduce, after about age50 男性更年期;SYNmale menopause
—andropausal / ˌændroˈpɔzl ; ˌændrəʊˈpɔ:zəl / adj.