African American, Hispanic, and white community-dwelling, older adults had similarly high rates of advance directive completion. The primary predictors of advance directive completion involved modifiable factors such as established primary care physicians, personal experience with mechanical ventilation, knowledge about the process of ACP, and physicians' willingness to effectively initiate such discussions. Some of the racial/ethnic differences in desire for collective family-based decision making that were observed in this study have implications for the evolution of ACP policy that respects and operationalizes these preferences.