People are happiest at the beginnings and the ends of their lives. The vast majority of Americans over 65 live independently. The older people get, the less afraid they are of dying. Aging is a natural, powerful, lifelong process. So how come so many of us unthinkingly assume that depression, diapers, and dementia lie ahead? Meet author and blogger Ashton Applewhite, who is catalyzing a movement to make discrimination on the basis of age as unacceptable as any other kind.