I like work. I love it sometimes. I just don't love so much of it.
I'm still a ways off from this decision, but the time will come soon enough, say age 60 in about 4 years:
A) keep working full time 5 more years to age 65 and be able to retire comfortably
B) work half time for 10 more years until age 70
(or something along those lines)
There are many things I enjoy on a part time basis but would not want to do full time. In talking with friends older than I am, many find (like the quote above about skiing, can ski all day or ski bumps, but not ski bumps all day), that they can continue to work full time, but don't have the energy to work full time and do much else. Currently I work full time, have middle school kids to take care of, do volunteer work, hike and climb and otherwise work out a hour or so a day. At that is really at my limit. As energy continues its slow decline at some point I will have to start cutting back somewhere. Working longer, but fewer hours might be a good choice to keep doing what I like, just less of it.
When the health issues rear their ugly heads, I try to find a different hobby to replace those I've lost.
I think as long as people do this they will be happy. A new hobby is a new chance to learn something, to master something and I think that makes most people feel good about things. I used to do a lot more gardening and woodworking, then cycled back to the outdoors hobbies I did before that. When I have more trouble hiking and climbing I expect I'll return to gardening and woodworking again. Or photography which I used to do, or something entirely new. The final challenge many face is getting old old and having trouble picking something new.
We live a world with knowledge of the future markets has less than one significant figure. And people will still and always demand answers to three significant digits.