You mentioned "dating" rather than "hooking up" and so I'll share some dating related perspectives.
After a couple of months of dating an 18 year old, I (at age 32) unwrapped my last virgin. Unlike the majority of above postings, I don't agree that this age ratio is easy and that these young girls are readily available to older men.
Seriously. Look around you. It's not as though every college freshman is passing on a college peer in order to be with a 30 something. My situation was a result of being at the right place at the right time. Perhaps having some prior female experience helped, but overall, it was more a matter of circumstance. On a forum, anyone can post anything, but I'm here to say that most likely, this is your actual reality.
Personally, it's kind of weird in some ways. I remember being with her and hearing an "oldies" song on the radio. I was thinking to myself that when that song was popular, I was in 11 years old. And by 5th grade, I'd already had four or five girlfriends and kissed as many. Meanwhile, she wasn't even yet in her mothers womb. Then I thought to myself... the year that I lost my virginity, she was probably in daycare.
While on college break, I picked her up at her mother's place. When you're sitting at a family table drinking iced tea and staring at a mother that was nine years older than me and a girlfriend that was fourteen years younger than me, it does give a man some perspective.
Again, your topic was about dating a much younger woman rather than a simple hook up and so I share my above experience. The sex was good and frequent,at social gatherings, I got evil glares from women my age (which was amusing) and friends my age envied me, but I confess that in some ways, I felt like a creepy old man as well.