Well, I'm straight (almost totally), but I have a good story.
First off, I am well over 50 and I am still totally attracted to women in their 20s. And, no, I don't feel creepy about it. Men are just wired that way, being very visual.
But here is the story. At work many years ago we had this guy consulting who was in his mid-80s at the time. He was old-looking, balding, had quite a gut, and wore giant coke-bottle type glasses. One day we were meeting in his cubicle right near the main hallway. I am facing to the left, and I see this really attractive woman in tight pants coming towards me from the left while he and I are talking. He the catches her out of the corner of his eye when she starts passing by the cubicle. Then he stops talking, and undresses her with his eyes as long as he can see her. I literally thought he was going to drool.
I said to him, "Bob - she's too young for you!" Without missing a beat, he says "I may be too old for her, but she's not too young for me."