Morbidity, mortality, and risk factors of emergency colorectal surgery among older patients in the Acute Care Surgery service: A retrospective study

•Most of emergency colorectal surgeries resulted from complications of colorectal cancer; age was not a contraindication for resection with primary anastomosis.•Clinical perforation leads to sepsis and septic shock in older patients. This may be modifiable to improve mortality by developing an early, rapid, protocol-driven surgical sepsis fast-track process.•Ventilator dependency is potentially modifiable with postoperative advanced surgical critical care.•Preoperative nutrition status, other comorbidities, preoperative anticoagulant use, location of disease, operative time, intraoperative fluid replacement, and blood loss were not risk factors of increased mortality.