The problem isn't retirement per se, it is that people don't have things to occupy themselves with. They retire and they vegetate. I worked with a lady that was in her 70s who was deathly afraid of retiring because she didn't have anything to do. That's beyond depressing to me, to be incapable of even conceiving of doing something that doesn't involve going to a job. We have created people that never develop as human…
The reason people go from work to nothing on retirement is because work fills up the nearly all of the productive hours of a person's life. If it were to take, let's say 4 days, or six hours a day, people would be so bored, they would be making projects, business ventures, or volunteering. And then on retirement, people would still have their hobbies and passion projects they had been working on their entire life. Th…
This is not what actually happens in practice. There is no sudden outbreak of productive activity because people have more free time. If this was going to occur there would be mountains of empirical evidence for it by now because this situation isn't rare.
I know many people with a lot of free time. In the vast majority of cases, people spend their free time in almost exactly the same way they spent their free time when they had less of it. Binging on social media, television, or games? Now they just do more of it for longer. The people that volunteer more were already doing it, and they are in the small minority.
People should probably work less but the idea that this will generate productive activity is a rationalization against all evidence.