BACKGROUND: The epidemiological data on elderly patients attending Accident and Emergency Departments (AEDs) in Hong Kong is lacking. The study aimed to examine the epidemiology of geriatric patient visits to AEDs in Hong Kong, including demographic data and predictors of life-saving interventions (LSI) and admission. METHODS: A retrospective cross-sectional study of geriatric patients older than 64 years old attending three AEDs during the year 2012, with a sample of 1200 patient visits recruited. The data were retrieved from the medical records of the respective hospitals. Descriptive characteristics of the visits were provided. Multivariate logistic regression was performed to evaluate the predictors of LSI and hospital admission. RESULTS: The mean age of the patients was 79.1 years. Totally 49.7％ of the patients were male. "Diseases of the respiratory system" was the commonest diagnosis in AEDs as well as that required admission. The admission rate was 56.8％. Logistic regression demonstrated that dependent activity of daily living (ADL), arrival by ambulance, and the higher number of co-morbidities were predictors of LSI, while advanced age, dependent ADL, institutionalized patients, arrival by ambulance, and higher number of co-morbidities were predictors of hospital admission. CONCLUSIONS: Ageing population is creating an imminent burden on the emergency service in Hong Kong. Previously unavailable epidemiological information about geriatric attendance to AEDs was described. This forms the basis for development of future studies concerning the medical services on this specific group of patients.