Aging is a preoccupation shared by beauty bloggers, serious journalists, scientists, doctors, celebrities--arguably all of adult America, given the pervasiveness of the crusade against it in popular culture and the media. We take our youth-oriented culture as a given but, as Lawrence R. Samuel argues, this was not always the case. Old age was revered in early America, in part because it was so rare. Indeed, it was not until the 1960s, according...