Objectives-To determine if persistently low or declining feelings of usefulness to others in later life predicts increased mortality hazard in older adults.Methods-Data on change in perceptions of usefulness, health, behavioral and psychosocial covariate factors, and mortality originate from the MacArthur Study of Successful Aging, a prospective study of 1,189 older adults (age 70-79 years).Results-Older adults with persistently low feelings of usefulness or who experienced a decline to low feelings of usefulness over the first 3-years of the study experienced a greater hazard of mortality (sociodemographic adjusted HR = 1.75 (95% CI = 1.22 to 2.51)) over a subsequent 9-year followup as compared to older adults with persistently high feelings of usefulness.Discussion-Older adults with persistently low perceived usefulness or feelings of usefulness that decline to a low level may be a vulnerable group with increased risk for poor health outcomes in later life.Keywords older adults; perceived usefulness; perceptions of aging; mortality Engagement in social and productive activities, especially those which contribute to the wellbeing of others and society, are often cited indicators of healthy or successful aging in later life (Fischer, 1995;Moody, 2001;Rowe & Kahn, 1998). The desire to contribute to others, be productive, and feel useful have also been cited as important motives for volunteerism and social activity in older adulthood Okun, 1994). Such activity may, in turn, benefit older adults' mental and physical well-being. A sizable body of research indicates that greater engagement in social and productive activity is linked to better functioning and health and greater longevity in later life (e.g., Glass, de Leon, Marottoli, & Berkman, 1999;Mendes de Leon, Glass, & Berkman, 2003;Menec, 2003;Musick, Herzog, & House, 1999).A handful of studies have also shown that what older adults think about their social value and usefulness may be as important as their actual activity in terms of an impact on health. Such work has focused on whether perceptions of social usefulness are linked with disability and mortality outcomes in later life. Studies of rural-dwelling French (age 60 years and older) and Japanese (aged 65 years and older) elders have shown that compared to older adults who frequently felt useful to others, those with low feelings of social usefulness were more likely Corresponding Author: Tara L. Gruenewald, tgruenewald@mednet.ucla.edu. to experience increases in physical disability and impairments in the ability to perform activities of daily living (ADLs) and more likely to die over follow-up periods of four to six years (Grand, Grosclaude, Bocquet, Pous, & Albarede, 1988;Okamoto & Tanaka, 2004). Similarly, not feeling needed by others predicted greater risk of institutionalization and mortality in a study of older Finnish adults (those age 75, 80, and 85 years;Pitkala, Laakkonen, Strandberg, & Tilvis, 2004)). These findings were recently replicated in a sample of older Americans; compared to el...