How strict are French ski resorts on IDs???

I recall a friend who overdid things at the Le Mans 24 hour race and had 24 hours as a guest of the CRS for his trouble.
Be sensible and getting caught with fake ID in France is likely to be less well tolerated than in the UK.

Remember we are all guests in foreign ski resorts and irrespective of the money we spend over there we should respect their hospitality. Not that I am inferring anything to the contrary about yourselves but a few discrete beers is probably better than getting caught with fake ID.

Spot on, Andymol2