I do confess, the first guy I dated after my divorce was quite tall (6'5") and somehow after him came a streak of very tall men (6'6", 6'4", 6'5", 6'3") - I could have had a basketball team! The 6'6" one picked me up shopping in Big Lots, so it wasn't even like I was seeking them out. (I think he lies about his height though - he is probably 6'7"). But my ex was just 5'10" and I once had a mad crush on my sailing instructor who was 5'3" (I'm 5'6"). I think my fondness for those very tall guys was because they had generally been quite awkward in their youth and we shared a certain outsider vulnerability. Also they did remind me of the tall, handsome, sweet, brilliant graduate student I pined for in college. He was the one that got away.

Still, I would never list height as a requirement on a dating profile - you never know who you might be missing out on.

Also, I've contacted men whose desired age range didn't quite extend up to my age, and almost none of them felt it was an issue. Youthfullness is more than just a number.