A retrospective cohort study analyzed 878 patients with liver cirrhosis and acute gastrointestinal bleeding admitted to Beijing You'an Hospital. Patients were divided into tertiles according to age, and the 6-week mortality was highest in the oldest group (18.21%). Age was confirmed as a significant independent predictor of mortality in all logistic regression models. Using restricted cubic splines, a critical threshold of approximately 58 years of age was identified above which mortality risk rises sharply. The effect of age was more pronounced in men and patients without endoscopic treatment, with a significant interaction for intensive care unit (ICU) admission, where the association was not significant. Age was strongly associated with mortality in patients with Child-Pugh C, intermediate/high Glasgow-Blatchford scores, and viral or viral-alcoholic cirrhosis. Study recommends early transition to ICU to reduce age-related risk.