This video claims France has a problem with social policy due to declining population, low productivity, and excessive interest on its public debt:
This article compares charts of Japan's so-called economic stagnation to the United States, Canada, UK, France, Germany, Spain, and Italy:
I haven't scrutinized the arguments for Japan's success despite nearly zero GDP growth and declining population. I just don't agree with the economic ideology that worships endless GDP growth and sees it as the solution to all political-economic problems. Economists should seriously study the possibility for political-economic stability on all points of the sigmoid growth curve instead of pushing the narrative of exponential GDP growth without natural constraints.
Joe