Suzanne Sommers is incredible. She's 64 and she's been cancer-free (breast cancer) for over 10 years, too.
Barbara Amiel, the writer, who is also married to Conrad Black, is 71 and looks like she's 25 years younger.
Granted, these women can afford the judicial use of plastic surgery and hormones, but still....
I'd also like to say that men in their 60s are wonderful. Some of my all-time favourite visitors are in this age bracket. The article Loralee posted emphasized financial security, which is important, but what I notice is a kind of genuine patience that comes with real maturity. Men in their 60s may not be able to have three orgasms in a night, it's true. But they can have one, sometimes two, that are deeply satisfying, which is what matters, anyway.
In my admittedly rarely-humble opinion, men in this age bracket are the finest lovers, too. One can expect that, if they want sex, it's because it really matters to them that they and their partner should enjoy the encounter as fully as possible. They know how women's bodies work, where the important places are and how to touch and torment them. Playing is a process: the goal is pleasure, rather than some particular peak experience that brings everything to an end.