Some research on the thread topic:
https://www.bbc.com/future/article/20150525-whats-the-prime-of-your-life
Our mental abilities rise and fall in waves
Although facts may take a little longer to stick, other skills keeps on developing – reading comprehension and arithmetic, for instance, continue to improve into middle age. Social reasoning – our ability to manoeuvre our way through the complexities of our friendships - peaks even later. In other words, our mental abilities rise and fall in waves – as one crest has passed, another is on its way. “There’s no age at which we are best at everything – or even most things,” says Josh Hartshorne at Harvard University, who conducted much of the research.
30% of healthy people aged 65-74 have s*x at least once a week
If sitcoms and movies are to be believed, your 20s and 30s are something of an ongoing orgy. In fact, neither s*xual desire, nor s*xual activity, fall off very quickly until well into your 50s. And even then the decline is far from precipitous. According to one paper examining “s*xually active life expectancy”, men who are 55 today can expect another 15 or so years of relatively frequent s*x; women of that age can expect slightly more than a decade. Intercourse may not be quite as regular or vigorous as it once was, but according to that study, 30% of healthy people aged 65-74 still enjoy s*x at least once a week.
What’s more, the falling s*x drive may have other compensations – just as your libido starts falling, your zest for life rises. This is something of a paradox, given the physical complaints that come with age, but it could be partly down to the fact that you have finally learnt to balance your emotions after the tumult of the previous decades.