I'm 24, and I really wouldn't mind dating an 18 year old, say. I wouldn't, however, want to date a woman who was older than me.
You must have read that and thought "what a paedo/pervert", so if you did, why do you feel that way?
If we both like each other, both are legal and both consent to sex, then why should it be such a big deal?
I once had a fling with a 17 year old when I was 21 ... we were explosively infatuated with one another and the only thing that stopped us were our parents. I bought her over to mine once and my mum asked what she was doing and she said "I'm still at school" lol. Ultimately we ended it on good terms.