Yeah, I won't invest in anything that is not fully functional on a single floor. A basement would be nice, but for storage and a bar, not for living in. Oldness comes on quickly.
Got to be thinking about that as you get ancient there, Paul. Don't want to be 70 and climbing up into a loft bed. Keep it single-level.
And I second the RV thing. You can get those things set up and ready to go, and go live in an RV park somewhere with all the other old coots looking to downsize.