It's the senescence that makes the fall, more or less, inevitable. Warren Buffet wrote about it in his final letter to shareholders [1] : "When balance, sight, hearing and memory are all on a persistently downward slope, you know Father Time is in the neighborhood."

[1] - https://www.berkshirehathaway.com/news/nov1025.pdf

had to check. glad he's still among us as far as i can tell.