Read up a bit on aged men(late 40s, early 50s) sexual health.
So there is sexual fatigue, where for reasons related to aging, the sex drive decreases, eg lower testosterone.
At that age, its just the sex drive that is lower, and maybe the stamina, but not the ability to have sex (thank goodness. of course if ability compromised, there are still pills to help out.)
I look at it from another angle, where we have gone through the quantity phase, and are now looking for quality, where the before and after of sexual intercourse are just as important and satisfying.
So, this is what growing old is like....
