I don't think i could handle spending time with a young girl less than 25 or so. They are just so freaking annoying.
I try to stay in the 30's range, but i did date a 28 year old when i was 41. Wasn't a big deal, she just wasn't very mature and it didn't last long. We had completely different ideals in life.
A buddy of mine is late 40's and has hooked up with some girls in the early 20's, i don't see it as a big deal as long as she is aware of it obviously.
My GF watches that horrible TV show Marrying Millions, there are some big age gaps there, but again if both people are cool with it who really cares.
It is very common for women to lie about their age. I can tell you at least 5 relationships i've had, the girl lied about her age by a few years. But they typically go down a few years. I had been dating this Latina for a few months and she's like "i have something important to tell you"; i was like thinking she was married or something. She tells me she is 39 and not 35.