Re: "Should you keep working?"
Ergkckglerk. Bad proofs! Bad proofs!
Maybe a lot of the people who quit working did so because they were sick or dying?
Not to mention by the time you get a reasonable time period and group of folks large enough to make a valid statistical sample, so much has changed since they were born that the results are almost completely inapplicable to modern generations.
Several better studies have shown no correlation between when you stop working and when you die. Health is possibly a different matter. I'm not sure sitting at a desk, stressed to the 9's all day every day was going to make me healthier or live longer than bouncing a baby in your lap at home.
Be fearful when others are greedy, and greedy when others are fearful. Just another form of "buy low, sell high" for those who have trouble with things. This rule is not universal. Do not buy a 1973 Pinto because everyone else is afraid of it.