We should not say that one man's hour is worth another man's hour but rather that one man during an hour is worth just as much as another man during an hour. Time is everything man is nothing: he is at the most time's carcass.
It is my art. I am better at it than I ever was. And I will do it as long as I can. When you reach a certain age you can slough off what is unnecessary and concentrate on what is. And why not?