“…Variation in the performance of tasks in the presence of others along the dimension of age may reflect differences in health, work status, and family structure between younger and older populations (Cornwell, 2011; Marcum, 2011). For example, older people may spend less time with others because of the need to do more private personal care activities due to the unique physiology of aging bodies (Aldwin & Gilmer, 2004); alternatively, they may need to rely on others for help with such tasks (Tang & Lee, 2011). Younger people tend to live in larger families—with children, and at least another adult present in the home—than older people, who are more likely to live alone or with only a spouse (at least in the U.S. noninstitutionalized population; Bures, 2009; Kobrin, 1976).…”