The answer to old age is to keep one's mind busy and to go on with one's life as if it were interminable. I always admired Chekhov for building a new house when he was dying of tuberculosis.
“Learn it well in your head, know it well, pick things you know and bring the old you and all the experience you have from singing these various kinds of feelings that are still related to what I have done in the rest of my career.”