From an evolutionary perspective, what reason would there be for a post menopausal woman to have interest in sex?
It is a general myth that women lose their sex drive after a certain age and while it is true for some(just like men), it is a generalization at best. It is also a myth that post menopusal women no longer desire sex. I can say from personal experience that this isn't the case either.
I used to subscribe to, just like many others that males sex drive peak at 18 and women at 30. I don't know who came up with this originally but the numbers are definitely skewed. I find some women encounter their sexual peak, or their 2nd sexual peak in their 40's. This is partially because they become more comfortable with their body and sexuality by this time so it's more enjoyable to them more than ever.
As for looks, I just had some interesting conversations with older women in dating. I've been noticing quite a few late 20's early to mid 30's gals looking actually older than some women in their 40's. I'm of the belief, just like some others that this could stem from the fact that the younger generation doesn't really take care of themselves due to makeup/digital pics/filters/only worrying about being seen online but also consuming a lot more processed foods and gmo things available these days that weren't available or in abundance before. It's all the processed and unhealthy stuff that is making younger gals age much faster IMO.
Just looking online, I would say it is VERY hard for any women to stay on top of her looks closer to 50. That is the absolute wall for even the top tier ones. The ones that take care of themselves with good genes could get away with looking decent into their 40's at best. Right around 30 though is when alot of females start noticing biological changes.
Also with more stresses and self created mental stresses of the younger generation, I've noticed a lot more premature graying of the hair with younger people too, as early as 30yo.
Just some observations...