I lived in a rental right on the Deschutes in that area for a year. Was fun catching fish in the back yard year-round, but that place was a little too far from civilization to be a great place for a retired couple in my mind. Nearest hospital would probably be Olympia, almost an hour away. As a young buck, even I got sick of being 30 minutes from even a convenience store.
I know from fishing that area quite a bit that, like most rural areas these days, there is more sketchy stuff going on in those woods than I care to think about. That said, I've never had any scary encounters/break-ins, etc. out there, so all things considered, it's probably safer (crime-wise) than Seattle.
You might check into North Olympia (out near Tolmie State Park). That area's growing really fast, but it's still much more relaxed than the Seattle area, and it's all middle-upper income housing. Close to all the shopping, health care, etc. you could ever want. If you sold a shack in Seattle, you could probably get a dream home in that area. That's probably true of almost any other place mentioned here, though.