Don't really have a plan, at least not yet.
Spent a year 2016/2017 when my wife and I moved back in with mom & dad while mom tried unsuccessfully to recover from misdiagnosis in ER then emergency surgery a few days later. Dad couldn't handle all of it alone and we didn't have a home at the time. I guess things happen for a reason. She died a little less than a year after we moved in and we ended up moving out only a couple of weeks after she passed. (It was planned that way. We were only supposed to be there temporarily until they figured out whether mom was going to get better or whether she'd need assistance coming in or whether she or both would go to a home.) Dad is doing fine, living in the only home he's known for the past 60+ years, lonely, but still splitting firewood by hand. He's 94. And although he'd like us to be there, he's doing well on his own, in his own home, just like he wants it.
In 2015, I had a nasty fall down a set of icy steps and shattered the bones in my left leg. Thanks to a good surgeon, it all got put back together again along with a few plates and screws that remind me of their presence every day. I was not able to put weight on that leg for 4 months. That was a bit of an eye-opener. I had never realized the mountain that one single step could be. I had never appreciated having to get around in a normal person's world when I was dependent upon a walker and/or crutches to go everywhere. I realized the value of open space, wide doorways, hand holds, ramps and ranch style houses.
In November of 2017, we bought the first house we've owned since 2005. It's a ranch house. Steps getting in are minimal and would easily be made to have none at all. The property is only 3.5 acres. I wanted more like 20+. I'm frustrated that my garden space is so limited and my privacy is not what I'd have liked. But when I think about it, this place may be more of a size that we can take care of it longer than if it were much larger.
We don't have much family. Other than dad, I have one older brother who lives 650 miles away. He has a family, kids, grandkids and a few great grandkids. My wife has two kids, one 500 miles away, one 2,500 miles away. They've joked that the one 500 miles away will deal with their bio-dad when he can't take care of himself anymore and that the one 2,500 miles away will take care of his mom and me. We do visit and stay with them for several weeks at a time and I suspect we could be happy there if it were necessary.
As far as actual nursing home care, we don't have any idea how that could happen. We're old enough that I rather doubt trying to find insurance would be practical. I don't really have an answer to that one.
So all of the above swirls around inside of my little brain hoping that there will be answers that will make themselves known. Unfortunately, none of us knows our own future. We have made efforts at becoming healthier. There is a lot of food (sweets, heavy carbs and sugars) that we've pretty much eliminated from our diet. We've both lost weight (close to 70 pounds this last year for me) and are considerably healthier than we had been before that. We're definitely getting more outside time on our little homestead which means exercise, sunshine, and fresh air, some of the work of such being rewarded with good garden produce. I know, no one lives forever, but taking steps like that seem like a good idea, especially before the medical complications take hold... heart attacks, strokes, T2D, stuff like that. I think we were probably on that path a little over a year ago and we felt like we had to make a change if we wanted to see anything even close to old age. I'm glad we did.
The story isn't written yet. We're only in our 50's/60's and the oldest of our grandkids is a teenager. Who knows what could become? We're open to what life offers as time marches on.
I'm appreciating reading what others are doing. Thanks to those who've posted.