I have to tell you, ssmguy, I am at that age and know a lot of women--and I am never shy about talking about sex. And I would say most are very interested--and it is the guys that slow down on them, not the other way around!
My mother is/was very HD--she has just about given up. She is almost 70 and is still very, very active and very beautiful--no one thinks she is that age! She doesn't want a 40 year old at her age, and, well, let's face it--most of the guys are dropping off at a pretty good pace in her age range. Lots of health problems, etc.
She doesn't want just a quickie (neither do I) so she hasn't had sex in a number of years.
I am very much concerned for myself being 47 and wondering if I have any hope (my H filed for D so I will get the chance soon to try for a good sex life). Even in this age range, I notice the guys are getting creaky.lol.
My one girlfriend (my age) has a 20 year old--that may be the route I have to take!lol.