True in many cases, but certainly not all. Pretty much everyone I used to work with either has or has had a part time job, but not because they NEEDED the money, but because that they liked getting out and having something to go to. Hell, I retired at 56 two years ago, and in that time I've had 4 part time jobs, and turned two others down that I would have liked to have had, but didn't like the hours. I liked those jobs, but one was seasonal, one turned from a perfect 3 days a week into a 4-5 days a week, and the other I just left for a better job with the company I retired from. I spent the last 5 months working part time for the company I retired from and loved it. I could basically name the days and hours I wanted to work. Will probably do that again next year and may pick up something in between if it looks like something I might enjoy. We're looking for a condo in Florida to do the snowbird thing for a few years and then maybe move permanently. If we find a place, I'll look for something there, like maybe a part time job in a marina. Just something to get me out and meet new people.
My advice for anyone wanting to retire....
* Put as much as you possibly can into a 401K
* Live within your means.
* Have your home, vehicle(s) and pretty much everything else paid off before you retire.
My wife and I were very fortunate. We both have pensions, had 401K's that we put a lot into, our kids have been out and gainfully employed for 12+ years, and we didn't owe anything when we retired. We don't live extravagantly, but we do things we like to do.