The boomers' impending retirement has spurred interest in tapping their productive energies to benefit society. This study examines older adults' decisions to stop or start formal volunteer work. The findings show that older adults usually stick with their original decisions, but more often stop than start volunteering. Volunteers who contribute a lot of hours over many years and who are married to volunteers are less likely to quit. And nonvolunteers are more likely to start volunteering if they have been uninvolved for few years and their spouses volunteer. The results highlight the importance of volunteer retention strategies for nonprofit agencies.