Bob, on a related note is the effect where you're casually looking around while strolling (eg, at the mall), notice some outstanding curves well beyond D-cup, are initially smitten, look up a bit, then as soon as your subconscious registers the likely age of the owner, you just want to scrub your brain with a power-sander.

On a related note, there's the age-old fantasy of being with an 18 yr old. That must be a fantasy for 20- and 30-somethings, because at some point I raised that bar to no less than 21, with a push to make that bar no less than 25. I don't know whether that's self-preservation, or whether that's got more to do with the more youthful mannerisms which just seem irritating now. Or maybe something to do with world experience, probability of intelligent conversation, or what.

Not that I fantasize about getting with much older women.

Although mind you, if Raquel Welch were to come a-knocking, I can't say that I'd snub her.

....
On another tangent, it's easier to have an appreciation for the lessons my parents shared with me when I was younger. Quite of few of those 'Aha!' moments.