Why are young bodies so captivating?

When I was in my twenties, there were very few good-looking classmates or friends around me.

Now that I'm in my thirties, looking at college students, they all seem quite attractive. Some are fair-skinned, some are full-figured, some are tall, some have big eyes, and some have great skin. There seems to be almost no unattractive ones. Isn't that strange?