ObjectiveTo investigate the features and changing trend of drug-induced liver injury (DILI) in the elderly from 2009 to 2019, and to provide a reference for clinical prevention and treatment of DILI in the elderly. MethodsA retrospective analysis was performed for the clinical data of 2107 elderly patients, aged ≥60 years, who were diagnosed with DILI in The Fifth Medical Center of Chinese PLA General Hospital from January 2009 to December 2019, and they were divided into groups according to age. Related clinical data were analyzed, including age, sex, clinical features, prognosis, and regional distribution. The Chi-square test was used for comparison of categorical data between groups. ResultsAmong the 2107 patients with DILI, there were 802 male patients and 1305 female patients, with a male/female ratio of 1∶1.63. Cholestasis type was the most common clinical type and was observed in 1439 patients (68.3%). There was the highest number of patients in the 60-64 years group (942 patients, 44.7%), among whom 618(65.6%) were female, 589(62.5%) had cholestasis type, 471(50.0%) had chronic DILI, 421(44.7%) had drug-induced liver cirrhosis, and 25(2.7%) had drug-induced liver failure. There were 187 patients in the 75-79 years group, among whom 110 (58.8%) patients were male, 137(73.3%) had cholestasis type, 114(60.9%) had liver cirrhosis, 4(2.1%) had drug-induced liver failure. The results showed that chronic DILI was more common in the 60-64 years group, and liver cirrhosis was more common in the 75-79 years group. As for prognosis, in the 60-64 years group, 27 patients (2.9%) were cured, 885 (93.9%) were improved, 30(32%) had no response or died; in the 65-69 years group, 16 (2.8%) were cured, 528 (92.0%) were improved, and 30(5.2%) had no response or died; in the 70-74 years group, 9(2.8%) were cured, 305(94.1%) were improved, and 10 (3.6%) had no response or died. The results showed that there was no significant difference in mortality rate between the different age groups (P＞0.05). The proportion of elderly DILI patients among hospitalized DILI patients increased from 15.90% in 2009 to 22.05% in 2013 and 27.51% in 2019, with a 1.73-fold increase in 11 years. As for regional distribution, the patients in North China accounted for the highest proportion of 47.08% (the patients from Hebei, Shanxi, and Inner Mongolia accounted for 24.92%, 10.96%, and 10.25%, respectively), followed by those in Northeast China who accounted for 17.85%. The patients in Beijing accounted for 11.53%. ConclusionThe proportion of elderly DILI patients among hospitalized DILI patients tends to increase in these years. Cholestasis type is the most common clinical type, and most of the patients with this clinical type progress to chronic DILI and drug-induced liver cirrhosis. Early diagnosis, early intervention, and standardized treatment of elderly DILI should be taken seriously.