"Sometimes people grieve when they find old age coming upon them, when they find their vehicles not so strong as they used to be. They desire the strength and the faculties that they once had. It is wise for them to repress that desire, to realize that their bodies have done good work, and if they can no longer do the same amount as of yore, they should do gently and peacefully what they can, but not worry themselves over the change. Presently they will have new bodies; and the way to ensure a good vehicle is to make such use as one can of the old one, but in any case to be serene and calm and unruffled. The only way to do that is to forget self, to let all selfish desires cease, and to turn the thought outward to the helping of others as far as one’s capabilities go."
January 1, 1970
https://en.wikiquote.org/wiki/Ageing