Disappointing to see the GOAT Djokovic have to drop out with a knee injury. But this is how it more or less goes for everyone as they get old. I actually think to a large extent it’s not that people lose their skills so much as the amount of work it takes to stay healthy and recover from repetitive stress and injuries becomes insurmountable.

Jerry Rice played WR into his 40s only because he was such a maniac at training, but even he got got by Father Time.