Further on the same thoughts, A motivational speaker we knew years ago said during a class that we should imagine the worst that will happen to our parents, even visualize it, take it in and breathe deeply and digest it as best we can. He said do that because it WILL happen someday. The more we process it now, the simpler it will be to accept it when it does eventually occur.
I'm not so sure how good that advice is for worrying folks like us but if you can do it and process the resulting anguish, the better off we'll be today.
What's that old saying, the past is history, future a mystery and today's a gift, that's why is called the present. Trite but true.