If you're at an age where flaccid penises and dry vaginas are common (normal) maybe rather than spending untold numbers of dollars and sleepless nights trying to reverse the course of nature you should consider doing what other creatures do; move on. Allow Mother Nature do her work.
We are the only species in creation who believe that sex is something more than an instinctual drive to procreate. Nothing more, nothing less. The fun and games are all our doing and one could say that there's no harm done. That's probably true; at least until it interrupts the normal process of aging.
Oh, I know, I know, that's a hard piece of reality to chew especially given the time, energy, and money humans devote to creating fantasy worlds that they desperately want to make real.
There comes a time when the eggs don't come as often and the sperm don't swim so well and that's the time to start looking for something else to do with one's life even though pharmaceutical companies will hate you for it.
There are some things that just don't need to be marketed and profited from; especially when they are conflicting with what's a perfectly functioning phase of human aging. Just tell yourself, it's normal, as mundane as it may sound. What's abnormal is fighting it and sending people off on a senseless quest to avoid life in the real sense of the word.