Men don't lose sexual function in midlife. Passion knows no age limits. Men may long for the sex of their youth.
Men often become more sensual with age.
If a man is healthy and doesn't have any relationship problems, his sexual functioning shouldn't be affected. This usually doesn't come into play until a man reaches his 60s. Earlier on, men are more hormonally driven. As they age, what arouses them is more psychological. They're looking at being in the moment, in touching and connection in a relationship, and for lack of a better term, less interested in getting off.