What would you do if you could live to 122, like the Frenchwoman Madame Calment, whose life span is the oldest ever recorded? What if you could do so and stave off dementia, Alzheimer s, and other common ailments of aging? What would happen if we stopped thinking of ourselves as aging and in decline, and instead started thinking of ourselves as chronologically advantaged? More effective than age-defying creams and anti-aging pills is a concrete understanding...