Getting back into cycling at my not so young age (58) and have had three spin classes in the last 10 days or so. Tough stuff, and not really at all how I ride a real bike for fun and distance. A bit too much sprinting for my tastes, but it will get me into better bike shape for Spring rides. I am near the oldest in the classes I have attended, and it is a bit of a badge of honor to me.
As far as eye candy...that would be my wife! I'm sure the guy behind us appreciated the view each time we went up in class last night. She has done pretty well for her age (56).
Jeff