Clinicians in the emergency department (ED) frequently encounter seriously ill patients at a time when advance directives may be pivotal in improved clinician decision-making. The objectives of this study were to identify the prevalence of advanced directives in ED patients, as well as patterns of advance care discussions between patients and providers. This study describes patients' perceptions and expectations of such serious illness discussions in an emergency care setting with the expectation of including patients as strategic members of the care team. Trained research assistants in two emergency departments surveyed patients over age 65, or their caregivers, from July 2016 to August 2018. Patients were verbally administered a standard survey tool related to advance directives and advance care planning. 497 out of 877 patients completed surveys (59.4%). 50% of patients reported having an advance care planning document. The large majority (92%) of patients with an advance directive had not been asked about it during their ED visit. When questioned about their personal preferences, 79% of patients thought emergency physicians should be aware of their wishes regarding life-sustaining treatments and end-of-life care. Paradoxically, only 38% expressed a desire to discuss advance care plans with an ED clinician. Older patients expect emergency clinicians to be aware of their care preferences, yet most are not asked about these care preferences in the ED. The large gap between patient preference and reality suggests the need for more targeted discussion by ED clinicians and translation of patient perspectives into system healthcare improvements. Future studies should explore barriers to advance care planning in the ED as well as patient preferences for these conversations to support a true healthcare learning system.