How Old Is Too Old?

I was just thinking about this.... Ok I've always looked older then what I really am..so naturally older guys tend to come at me more then younger guys (my age) What I want to know is Ladies whats the oldest you'll date a guy at the age you are now? And whats the youngest And for the fella's whats the oldest you'll date a girl..and the youngest... Also I want to know why its ok for a guy to date a girl who is significantly (s/p) younger then him..say he's 25 and she's 18..but its almost as if its ok..but not for a female..if she's 25 and her boyfriend is 18 ? I'll answer my own question by saying the oldest guy I ever talked to was 28..and i was only 17.. I didnt see any type of relationship coming out of it and I figured he just wanted to fucck...so i let him spend his money on me for a couple weeks..then i stopped answering his calls :roll: I know its kinda cold...but what really can come out of a relationship like that?? So yeh why is it ok for a guy to date younger women..but its not ok for a female 2 do that?

oldest- late 20's youngest- 16

im 18, the oldest i would look at is 45