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Yes i get that, sadly france isn't the way it was and lots of places are devoid of shops or services now. The rural fabric, while less tellar than the Uk, can be very socially dead in some areas and just as remote.
One of the fastest growing industries is personal assistance to the elderly. Obviously generalisation is impossible, people follow all sorts of retirement trajectories, but the homebuying relying on loans rather than mortgages, the system works quite differently.
No this is not true, in france people mostly stay where they live when they retire.