I think a lot of people tend to fall into the patterns adopted as school where you never typically date anyone more than a couple years above or below you.
But on a practical level I could never date anyone that was fresh out of highschool.
I've changes since then and I don't want to accompany a novice along all the early adult lessons. Been there, done that.
I usually think +/- 5 years my age. That seems a good range of women with similar maturity and experience.
I suppose I could have some random fling, but thats never been my priority.