I actually don't mind dating a woman no more than 2-4 years older than me but I also would never want to date a woman who's old enough to be my mother. It's a disgusting feeling for me. Another reason why I refuse to date older women is because we're too far different from each other culturally (different decades of growing up) and personally. Don't get me wrong, I would never date an underaged girl not only because of the law but because I don't want to feel like a pedo and they too, are far too different from me.
I mainly prefer mature women strictly of my own age.