I can relate directly to yer last point Professor.
Ribs can too. He's older than dirt.. I am not quite that old. That said, being above 70 let's ya know when ya has reached yer limit and yer body needs a nap.
Yer mind doesn't remember things like it once did either. And ya tire more easily after doing some work that one would not have given much thought to five years earlier.
For someone Ribit's age I find it remarkable how keen his wit is for his age. Better than mine by far.
And I ain't that close to Ribit's age..
It must be them gritz greasing his brain....