“I’ve also noticed that his estimation of his age changes by the day, based on how he feels. When he’s really tired, he’ll sigh and say, “Maybe eighty-five today,” but when he’s feeling more upbeat he’ll say, “I think I’m sixty today.” Perhaps this is as good a way of estimating age as any—how old do you feel? What else matters, really? Still, I’m always trying to figure it out.”