Along the lines of what Troph said above, I'll be 60 this summer and I'm thinking the olds might not have such a rosy future here.
Just thinking out loud a little, you can spend 180 days in Mexico just with your passport. I assume that's 180 in a one-year peiod, but I've seen where some people have spent almost their whole 180 days, went somewhere else for a couple of weeks, and then returned to Mexico for another 180 days. I doubt that's something a person could get away with with any regularity ... BUT, you can also spend 180 days in Canada, 90 in Spain, Italy, or Portugal, etc.
Short of actually getting citizenship somewhere else, I could see us country-hopping just to stay away from the US as much as possible, at least until we're too old to do that. I'm wondering if a person could accumulate enough days in-country that way in one or more of those countries, to the point that they could satisfy residency status requirements. I'd love citizenship, but simple residency is fine in most countries afaik, esp as long as it keeps me out of living in a potential hellscape that may be what the US is heading to.