My bank is offering savings accounts that pay, like, .01% these days, so it's not so much a bell curve as just the right half of a bell curve. You can get a bit more interest from investments, but your risk goes up too. It would suck to be 50 after 15 years of not working and find you don't have any money. Would you even remember how to tie a tie?
Anyway, the big wild card is health care. Nobody will insure you as an individual if you have a health problem, and the bills you can rack up at the hospital are almost open-ended. I went in for just a couple days last year and they billed my insurance $26k.
It's not at all clear to me the changes the Democrats made last year will survive the next. I'd want at least 4-5 million in the bank just to feel secure on medical.