It is bullshit. I’m a woman, almost 77 years of age. Had plenty of sex in my younger days to last me a lifetime. Gave me two sons who are in their 50’s now. Got divorced in 1978, dated until I was in my mid-40’s, then decided I didn’t care about putting up with someone else’s bad habits. I preferred my privacy and solitude instead. I’ve outlived everyone in my family. Only one of them lived to be 74. The rest died at ages 51, 69 and 73.
There you go.
You were inoculated... frequently, at an early age.
Why only plenty of sex in your younger years and not now? From my understanding the sexual drive continues throughout and past the golden years.