Perhaps most notable- the young are the most conservative generation in France except for those over 60.
Any information on voting by ethnicity and religion?
Also, look at the voting by class. National Front does best among the working class(ouvrier), but steadily declines as you move up the income ladder... until you reach the upperclass(artisan, commercant, chef d'enterprise), where NF registers it's second best performance.
Also notably the upperclass registers 0% support for minor parties. And the fact that Bayrou does badly among them... I'd have thought he's precisely the kind of socially liberal establishmentarian that would appeal to them.