"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?"

This quote by Arthur Miller talks to the value of honing one's craft and focusing on what is important. Miller is suggesting that as we age, we can release what is unneeded and concentrate on what is essential to us. He is emphasizing the value of his art and how he has become better at it than ever before. He is also expressing his dedication to continue doing it for as long as he can. Miller is encouraging us to discover what is necessary to us and concentrate on it, no matter our age. He is recommending that we ought to not let age be a barrier to pursuing our passions and dreams.