My folks are 91 and 89, and they still get around pretty good, but as my dad says, "It's only a a matter of time, to be brutally honest...."
But I haven't spoken to my asshole sister in over 25 years now, so when "that day" comes, my wife has agreed to step-in and act as an intermediary between the two of us. Thankfully she (my sister) has done pretty well for herself (or so I've heard), and she's not a hoarder, or greedy, so maybe things will go smoothly.
We'll see.