According to this poll, most folks on this forum have retired 5-10 years before eligibility for SS.
What age people on ER actually retired
This doesn't surprise me. There is much sense in having a large gap between FI and RE. A frugal, highly-compensated employee might reach FI in the sense of Mr. Money Mustache in his or her mid-30s, but for whatever reason, chooses to work full-time for another 20 years. To my earlier point, our actual age-of-retirement is often not much younger than the median American age of 61-62. So many factors conspire to make it so, even for folks of modest needs and surfeit of money.
What does surprise me, is that apparently most of the regular-posters on this Forum are of quite advanced years. Occasionally we get an update such as "Greetings! Last year, I retired at age 55, and now at 56 I feel great! I should have retired sooner!" ... this is fantastic. But such folks rarely engage in social commentary, investment-strategy debate, talk about EVs and so on. They make their triumphant updates, and disappear. The people who do post regularly about their next car purchase, or their approach to buying a house, or their thoughts on the S&P 500, tend to be 70+. Sure, these folks may have successfully retired 15-20 years ago, but now they've aged into the traditional "senior citizen" age-range.
A specific example is the unrelenting unanimity in choosing a taller vehicle, because supposedly it's easier to enter/exit them. And that modern "driver safety aids" are a must-have. And there I was, daydreaming that this might be the venue to bench-race dream sports cars, that we could never afford in our youth, but that now perhaps we can!