That's one way of doing it, but there's no one-size-fit-all solution. Some do what you said and just stop spending anything. Not everyone retires either, it's just that they do work they like because they can afford it rather than having to.

It's really a personal experience, I know myself I don't feel like my life is missing anything even if I'm putting money aside to my future. I'm still traveling at least once a year, and I eat pretty good food all the time. At the same time, I don't have a car and rent one whenever I need one.