>In our society older men marry younger women and
>older women don't marry younger men. That is the politically
>significant proposition
I'll ignore everything else you've said and stick to this. Even in a socialist, egalitarian and non-sexist society, older men might still go out with younger women much more frequently than older women go out with younger men.
It is certainly true in ours, but I'm not convinced this is politically relevant.
Brett