I have since researched this, and I see that Aaron had knee replacement surgery in 2011-ish, and Morgan had the same thing roughly 13 months ago. I am not an orthopedic expert, but I would think "those issues" would be resolved by now. Maybe not. Also, I am mindful that Aaron is 81 years old. Still, it was unsettling to see such formerly-great athletes using canes under any circumstances.
On the good side, both sounded fine and seemed "clear," so they are seemingly not dealing with any dementia or neurological problems. But I am now convinced that I am much older than I think I am.