A study was made of the Emergency Department records of 49 elderly (65 years old or older) and 49 middle-aged (40-64 years old) patients seen in an urban hospital's psychiatric emergency service. The data were compared for demographic and admission information, psychiatric treatment history, presenting complaints, symptoms, diagnoses, and final disposition status. For the elderly patients, the referral was more likely to be their first contact with psychiatric treatment, and they were more likely to be referred (accompanied) by family or friends than to be self-referred. Among the middle-aged patients, "substance abuse" (e.g., drugs, alcohol) disorders and schizophrenic disorders were more common. The elderly, however, were much more likely to be regarded as having an organic brain syndrome of unspecified cause (34.7 per cent vs 0). Access to treatment was fairly consistent for both groups as measured by the hospital's priority code, total time spent in the emergency department, and final disposition. These results raise important issues concerning the unique psychosocial characteristics and psychiatric treatment needs of elderly patients. This applies particularly to the emergency-department medical clearance of elderly patients with symptoms of organic brain syndrome.