Are they kidding? As soon as more people start moving to these places, costs go up and they won't be so affordable any more. I posted something like this recently and discussed an economic concept called "the indifference principle." That was about affordable housing markets in general. Now these places for retirees might specialize in goods and services that retirees like, so maybe the older folks should move there. But this is like saying that if you like to surf, move to California and then saying "here are the cheapest places for surfers." They won't stay cheap for long.
I was not planning to post today but this came up. My next planned post was tomorrow and it will be something sexy.
America's Most Affordable Places to Retire