A paid off mortgage and no other debt is a retirement objective that has been achieved by practically every retiree in my family. I can only think of one who is still paying on a note. Things are different in low cost of living regions of the country. You can actually get out of debt servitude and live a reasonably decent life fairly cheaply. I have an aunt who has outlived her and my late uncle's retirement savings at age 99, and she's holding it together OK on Social Security alone.
I’m very happy for you and yours. I do not believe it’s the norm though.