I don't expect to have a retirement, but not due to demographic factors. I don't expect to have a retirement because Sarkozy then Macron have reformed the pension system despite quasi-unanimous opposition across the political spectrum. They are taking it away from us, and short of an actual revolution there's nothing we can do about it.
However, it's important to note that the equation cannot be equated to euros and jobs. As i previously mentioned, due to the increase in productivity in the past centuries, it's now possible to feed and house the entire population with lesser people working these fields. If a government wanted to find a solution, they would at least study the emergence of bullshit jobs, what jobs are actually "essential" (as they said during COVID lockdowns) and how to better share the actual workload and benefits across society.