Would it be too much like mothering to have the heroine fall for a younger man? Especially if it was a Pygmalion/Suzy Wong type story where he was uneducated. I can't see it being very attractive, but is that because I'm so steeped in my own culture that I can't see outside the box?
I'm trying to think of a new idea for a plot, but I don't think that one is going to be it. You'd have to be sensitive about class and cultural issues as well. What about a posh uneducated hero? Oh, that was Tarzan, wasn't it?
Rats, there must be some twist that would make it work.