My dad is 85 and this article hits hard about what he fights going on in his body. What sucks is how much of a downward, self reinforcing spiral it all is. It's so hard to see the curbs to walk over or how to get to a thing himself, so he just naturally chooses to do fewer and fewer things. Watching TV is safer and kinder and becomes the default to anything. Which just makes his brain less and less stimulated and act…
When you stop walking, that's the beginning of the end.
Then the dog died. Instead of walking 10km per day, she lay on the couch staring at the ceiling. About 3 months later she started getting lost on her way to the supermarket. Fifth time she got lost we decided to put her in a home for demented people. We simply couldn't provide the care she needed any other way. Took a few more months and she stopped recognising us.
I think she outlived her dog by about 18 months, iirc.
She stopped walking, and then age came fast for her.