Background: Acute complicated calculous biliary disease (ACCBD) may pose challenges in an ageing population. Frailty and comorbidities increase the potential risks of surgery; thus, surgeons may opt to offer operative treatments less often to their older patients. We set out to capture the incidence and treatment algorithms used across Europe to treat older patients presenting with ACCBD.Methods: Analysis of the European Society of Trauma and Emergency Surgery (ESTES) 2018 Acute Complicated Calculous Biliary Disease audit was performed. Patients undergoing emergency hospital admission with ACCBD between 1 October 2018 and 31 October 2018 were included. The primary outcome measure was operative intervention in patients over and under 65 years of age. Mortalities, post-operative morbidity, time to operative intervention, post-acute disposition and length of hospital stay were measured as secondary outcomes.Results: The median age of the 338 patients admitted to the snapshot was 67 years; 185 patients (54.7%) were over 65 years at time of admission. Significantly fewer patients over 65 underwent definitive surgical treatment, compared with those under 65 (37.8% vs. 64.7%, p <0.001). Surgical complications were seen more frequently in the over 65 cohort. Post-operative mortality was seen in 2.2% of over 65s versus 0.7% under 65(p=0.253). Mean post-operative length of stay was significantly longer in the elderly cohort. In patients surviving to discharge, post-acute convalescence or rehabilitation was required in 13.3% in the elderly cohort versus 1.9% of those under 65 (p=0.002).Conclusions: Elderly patients commonly present with ACCBD. Increased frailty and incidence of comorbid disease in this population increases the potential surgical risk. In our snapshot, elderly patients represented the majority, but far fewer were offered definitive surgical treatment. Post-operative mortality, morbidity, length of post-operative in-hospital stay and the requirement for post-discharge convalescence were higher in this group.