In my case, I had my house paid off LONG before I retired at age 51, and I had no other debts besides the mortgage. I figured that the less monthly expenses I had, the less regular income I'd need.
BTW, I owned a municipal bond once for a couple of years about three or four decades ago. I understand them, to the point that my conclusion was that they didn't make any sense as a long term investment. At least not unless you're buying them in a very high interest rate environment.
Municipal bonds have limited utility. If one is in a state with a high state income tax burden, they can help avoid some tax if you buy munis for that state. Other than that, they tend to have lower returns than bonds with equivalent risk. And while they used to be pitched as lower risk than corporate bonds, I don't think that's a legitimate conclusion these days. See the Jefferson County (Birmingham Alabama) Sewer Bonds....