I'm in that bucket myself. I'm nearing 60 and finally have all my ducks in a row with enough savings to last me 30 years at 80% my current income (not including Social Security which should plug that gap nicely along with any part-time work I might want to do for fun).
I'm not worried about running out of money at 90. I figure if I make it to 90, I'll be sitting in a rocking chair on the porch all day reading books from the library so I won't need much then anyhow.
But I'm willing to go another 10 years. If I make it, I'll have 40 years of full income whether or not Social Security is even around. But no way will I live to be 110 so in that scenario, I'll be leaving a bunch of money for the kids.
So my kids at least are rooting for me to work 10 more years!
Way ta go!!
If I may make a suggestion (as someone else posted on this thread), be sure to account for inflation. Income that's good enough now won't be good enough in 5 or 10 years. So I hope that what you called "savings" is really investments that grow fairly well, even if a portion of the investments are in relatively safe funds to handle market downturns.
I retired at the end of 1994 at the age of 51. My experience is that it's a lot cheaper/easier to live at this age than they said it would be. I'm in good health for 77 too.