Most research, however, continues to emphasize only one or two of these components. For example, Depp and Jeste (3) reviewed 29 studies of predictors of healthy aging; no single component within the Rowe and Kahn outline was common across all studies. The large majority included physical function (26 of the studies), but different subsets addressed each of the other components (e.g., 13 included cognitive function, nine included mental health and well-being, eight included social engagement, and six included chronic illnesses). There is no doubt that physical function is important in aging, and it is receiving growing attention in the aging literature. Physical syndromes, such as “frailty,” are being rigorously defined (4), and standardized objective measures of function (e.g., the Short Physical Performance Battery ) are increasingly used by researchers interested in determining how physical health can be maintained with aging. But this attention to evaluating objective measures of health is not necessarily the only approach to improving the “healthspan.” Indeed, initial research indicates that older persons’ level of physical health or function is not in fact well correlated with their own perception of their “successful aging” (6, 7). This suggests that additional focus on understanding contributors to self-perceived health in aging could potentially yield improved quality of life in older persons.