Young and virile. Slowly, age creeps up.
Have you ever noticed that the older people get the warmer they like it? My own mother (now 96) wears a sweater in temps under 85F. It's a slowing of circulation. And, that is also why we men begin to have difficulty in the boner department.
"It may be a matter of blood flow" is not simply a slogan used to sell boner pills. Those videos of elderly folks sitting in chairs, moving arms and legs as exercise that we laughed at? Those exercises work to get the circulation pumped up. Stay active, keep moving, keep the blood pumping, and you may be surprised at how much easier it is to get it flowing where you want it to go.