It was funny to me, too, to read "older men = over 30". I just turned 31. It still hasn't hit me that I'm old, mainly because I'm young at heart and a special case. I lived extremely conservative my first quarter century, so I have no basis of comparison. I've only been having sex for just over four years, so I don't know what sex would have been like during my teen years and early 20s.
I haven't had enough sex with enough different women to have a good sample size and prefer an age range over another, (I'll take them indiscriminantly) but I still currently have a preference for the younger girls.