We evaluated the clinical usefulness of the preoperative risk assessment models in emergency gastrointestinal surgeries in elderly patients: the physiological and operative severity score for the enumeration of mortality and morbidity (POSSUM), its Portsmouth (P-POSSUM) modification, the estimation of physiologic ability and surgical stress (E-PASS), the systemic inflammatory response syndrome (SIRS) and the quick sepsis-related organ failure assessment (qSOFA) score. Materials and Methods: A total of 107 elderly patients over 90 years of age, who underwent emergency gastrointestinal surgeries in our hospital between April 2013 and March 2018, were enrolled in this retrospective study. The morbidity and mortality risks were assessed using these models. Results: The reasons for emergency surgery in this study were strangulated intestinal obstruction (29.0%), strangulated hernia (17.8%), bowel perforation (16.8%) and acute appendicitis (12.0%). Postoperative complications were observed in 61 patients (57.0%) including 7 (6.5%) in-hospital deaths. Ninety patients (84.1%) returned to the same level of activity after discharge. There were statistically significant differences in the following three scores; the preoperative risk score (P=0.008) and comprehensive risk score (P=0.015) of the E-PASS score, and the SIRS score (P=0.045) between patients who died in the hospital and those who survived. Conclusions: The preoperative risk score and comprehensive risk score of the E-PASS score, and the SIRS score seemed to be useful for preoperative risk assessment of emergency gastrointestinal surgeries in patients over the age of 90.