I think the older man/ younger woman thing has been going on in real life mainly because of the things that attract men, and the things that attract women. How many couples do you know in real life where the woman is younger... sometimes much younger?
However, in WOT you mention the long lifespans of women channellers. I don't think that really affects the things that attract the women to the older men in the first place. Love really isn't thought out. It's there or it isn't. I think the Aes Sedai and the women of the waste deal with it in good ways for them, but it just seems weird to us because 1 man and 1 woman can live together for a lifetime in our lives. In WOT, you have wise ones that get married 3 or 4 times in their long lifespans. The Aes Sedai may not get married, but their warders get old and die... and then just get replaced by younger warders.
The women just get lots of lovers because they live so long.
However, in WOT you mention the long lifespans of women channellers. I don't think that really affects the things that attract the women to the older men in the first place. Love really isn't thought out. It's there or it isn't. I think the Aes Sedai and the women of the waste deal with it in good ways for them, but it just seems weird to us because 1 man and 1 woman can live together for a lifetime in our lives. In WOT, you have wise ones that get married 3 or 4 times in their long lifespans. The Aes Sedai may not get married, but their warders get old and die... and then just get replaced by younger warders.
The women just get lots of lovers because they live so long.