Following are some excerpts from the OP-linked article.
..telephone interviews of 1,600 adults ages 45 to 80. Half were retirees and half were pre-retirees, who were still working.
Half of retirees (51 percent) report that they retired before age 60...
While many pre-retirees say they expect to continue to work well past traditional retirement age, that may be “wishful thinking” — or an excuse for not saving and preparing, the report says. The reality is that many people actually retire earlier than they expect, whether because they lose their jobs and can’t find new ones, or because of failing health.
Remember that only people still alive get to participate in the survey. Dead people do not take phone calls. Hence, we cannot say 1/2 X 1/2 = 1/4 of people are early retirees.
So, I wonder how many even get to retire at all. Not all those who work until they die are working into their 70s and get to die of old age. We have friends that died in their late 50s or early 60s, and never made it to retirement. They would not be represented in the above survey.
That makes winners out of the people who even get one day of retirement life. I might have told a story of a man who retired from my former megacorp on Friday. On Monday, his wife called the office to say he died of a heart attack on Sunday.