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.
The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.
The tendency of old age to the body, say the physiologists, is to form bone. It is as rare as it is pleasant to meet with an old man whose opinions are not ossified.
To resist the frigidity of old age, one must combine the body, the mind, and the heart. And to keep these in parallel vigor one must exercise, study, and love.
We should so provide for old age that it may have no urgent wants of this world to absorb it from meditation on the next. It is awful to see the lean hands of dotage making a coffer of the grave.