Jeepers, Bill, are you in good health? If so, you should have something around 20+ years to go. Don't go planning your funeral just yet, OK?
As for spending the last years in an AS, just not practical really, is it? I mean, you won't be able to do many repairs, there is NO room for a wheelchair, and why try cooking your own meals on a propane stove when there are nice apartments that will assist you in doing that or even do it for you?
Let's not even get into the winter situation, unless you're planning on being waaay south.
The thing is, you really don't want to be alone then, I figure. Too many things get hard to do on your own.
I guarantee you will be happier if you are around others in your Golden Years, so start thinking alone those lines, you might feel better about it!
If it's to be, it's up to me.