Would this not depend on the type of work being done and type of working conditions? Doesn't working in a boring, unchallenging, repetitive, dead-end job, dull the senses? Also, now a day, people continue to work even into their 70s, 80s, and even 90s, at least those that can find work. I don't see many people opting to retire when they have bills to pay.
Stan Lee used to say something along the lines of: “I’m not working, I’m playing!” If the job feels like fun, then the primary argument makes more sense to me. Based on past experience, however, I can relate to the later as my senses definitely got dulled, add to that compounding age-related health problems which did not help.
I try to do some Sudoku & Mahjongg puzzles at least twice a day, in my Linux machine, just to keep my mind awake.