Be sure and tell your older man. But beware, you may find him despressingly mature and get nothing more than a patronizing pat on the head. Still, he'll be flattered and would probably love to have you if life wasn't so complicated. He also might reject you for your own good - unrequited love is a pain. Actually, I find myself getting tremendous crushes on certain woemen regardless of age, but nowadays I'm feeling a little silly about it if she's 20 years younger than me. Funny how you start psychoanalyzing once a relationship is "out of the norm" ---- but hey, who the hell is "normal?"
Inexperienced dude: The body is the last thing to wrinkle. I know a 58-year old woman with a better shape (naked) that most women half her age. I understand your lack of perspective. Until just this last decade, I, too, had misconceptions about the sheer number of hot babes over 40. I was hopelessly deluded into thinking that they were all flabby and disgusting like my Aunt Grace.
Thank Gob for the Internet.