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My wife and I both retired, or rather quit voluntarily. She did not have any pension or benefit, but the work condition got to her. That division of her megacorp (one of the Dow 30) was having a bad time, and the pressure was horrendous. They wanted to fire all the people working for her, and sent her to India to train replacements. So she quit, and never thought of finding another job.
I was working part-time already for almost 10 years, and one day did not want to continue. And that was that.