I took early retirement four years ago with a small pension and partially paid health insurance. I worked all of the retirement calculators at the time and the numbers worked out ok. So far I am in decent shape as I have a frugal lifestyle and no debt. On the plus side, I spend less than I anticipated. On the minus side, my 401k type investments are not going as well as the calculators predicted. I am conservatively invested and interest rates are not even keeping up with inflation. And the stock market is lower today than the day I retired. The retirement calculators pretty much blew it, so far anyway. I think it will all work out and cannot imagine returning to work. Life is pretty good and I feel very fortunate. I would estimate that half or more of my co-workers who retired have returned to work, either due to money issues or for the structure of work environment.