I've just clocked past the twenty mark, and personally I wouldn't date a guy more than 5 years older than me, simply because of the different priorities in life. But I do have a best friend who sounds just like the girl in your post. At one point she'd started seeing a 30 year old co-worker, before completely finishing a relationship with another considerably older man. She never got serious with the either of them, whereas I sense that they were looking for someone to commit to. My point is, other than sexual gratification, I don't think it would do you much good entering a relationship with any kind of expectations with a much younger girl.