But employees are not just pure net gains. If you hire a bunch of "retirement jobbers" you will still have to manage them. It sounds logical at first that you simply hire a few older people for lesser pay but in Europe the question is also why a 65 year old would accept a far lower paid job if he can simply go back on welfare and get paid the same? The reality will probably be that most old people will be unemployed so long that nobody wants to hire them even if they could hire them for a very low amount. People at that age will have a lot of pride built up, they are not going to want to stand in a supermarket for 3h a day either. Is society really going to force them? So far they are barely even willing to force young people to get jobs.

Just because you can hire a 68 year old to do content moderation or be an assistant teacher... does not mean that anybody actually wants him around at that age and that he will be a net gain to the environment. His speed and ability at work is inherently going to limit other people's speed in some way or form,not even just that. Even his vibe, his impact on the team. These things are all things that people consider during hiring. It's the concept of "the chain is only as strong as its weakest link" I suppose.