Its the usual societal double standards for men and women. Women are considered $lutty if they have several partners, while men are considered to be gaining experience and sowing wild oats. Times are changing, hang in there.
That is SO true no heart, I for one prefer younger guys, and I think its great if older women date them, as its fine for Older guy and women, its a personal preferance, as for what ZBig said, the older woman and the children thing is true, and some young guy MAY be giving up a chance at having kidlets.... but once again a personal choice... some women have kids in their 40's and I know my eggs are poaching ... lol But if I am meant to have them and its with a younger guy then great !! if not .. thats cool too ....
I think this might have it's roots in the physical and social evolution of man. In the beginning, it was all about propagation of species (survival). The ones who stood the best chance of producing offspring were considered the fittest and were sought out as mates. Unfortunatly though, this stigma (foolishness)
has endured and become a cultural stigma. In todays world it shouldn't be all about propegating the species, people can afford to be more concentrated upon quality and what/who brings them more intellectual and physical pleasure.
My guess is that an older man and a younger woman can still have children together. Now with an older woman and a younger man, he just might be giving up his chance to have a family of his own. Now before I get jumped on, (ladies) this is my GUESS as to why SOCIETY frowns on this match. I am well aware of adoption options and the strives in the medical community.