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Purpose:  Research concerned with the relationship between volunteer activity and psychological well-being has typically reported higher levels of well-being among older adult volunteers relative to nonvolunteers. However, few studies have examined nonlinear associations between frequency of volunteer activity and well-being. We examined nonlinear associations between hours spent volunteering and psychological well-being, controlling for employment status, partner status, physical health, and education. We also investigated associations between different domains of volunteer activity and well-being, along with the possible moderating effects of gender on these relationships. Design and Methods: We used data from the PATH Through Life Project, a population-based study of Australian adults. Participants consisted of 2,136 older adults aged 64 to 68.  Results: Nonlinear …