Pablo Casals, possibly the finest cellist to play the instrument, was once asked why he continued to practice at the advanced age of 90. He answered “Because I think I am making progress.”
There is debate as to how old he actually was when making the statement as there are several instances at various ages found on the internet. But he did say something to that point and it is advice that everyone striving to do their best possible work at any craft should take to heart. That an artist of his accomplishment, revered by all who appreciated fine music performance, should see things this way speaks strongly to the rest of us creating our art.