This is a fairly predictable consequence of economic stagnation. France is still below its pre-Covid level of GDP per capita, while Germany only caught up. Both countries, and most other countries in Europe, seem to be permanently stuck at a GDP per capita level 20-30 percent below the US.
There are lots of excuses for Europe’s lower economic dynamism relative to the US, about how it’s a trade-off for improved quality of life (more vacations, etc). But young people benefit disproportionately from dynamism, because they’re the ones working their way up. If young people want economic opportunities and the economy doesn’t give it to them, you’ll see the frustration appearing at the ballot box.