I think we would have to eliminate the possibility that women or men voted 100% for anybody.  That doesn't happen.  You've said it's nigh-impossible for women to have split 50-50.  It seems likely that one of two things happened:  (a) a large majority of women and men voted for Sarkozy, in roughly equal proportions, or (b) a majority of both women and men voted for Sarkozy, but a larger majority of women did.

We have no evidence (that I know of) that (a) is not true, but everyone here seems to be assuming that (b) is the case.  It would not surprise me if (b) was in fact true, but I just wanted to note that we do not have the data to support that, and if it's true, we don't know how wide the gap between senior men and senior women was.  Without that data, all this speculaton about older women being overwhelmingly more conservative and listening to their priests more is not terribly constructive.

Really, all we know is that a significant majority of older people voted for Sarkozy.