englishal
I think you'd find that in Arizona your brain would turn into jelly only marginally slower that it would do so in Spain
I've been there, can vouch for your property prices, but there is nothing to do there. Nothing except take thousands of pictures of the Grand Canyon, Bryce Canyon, Canyonlands National Park, Monument Valley (that's into Utah, where property is even cheaper...)
Retirement in Spain is for people who are mentally finished and are ready to spend the rest of their days sitting in the sun and drinking wine or whatever, chatting to their chums from Chelsmford, watching East Enders on Sky TV.
WKW
The Murcia air park is like that too. The runway is there and that's more or less it.