An ageing population is leading to an increase in patients attending emergency departments (EDs) with comorbidities and age-related syndromes such as frailty. Frailty is a clinical syndrome defined as an increased vulnerability to age-related or disease-related insults in older adults due to diminishing physiological reserves. It also places increased demands on staff and hospital services. Screening for frailty early in the care pathway ensures goal-directed and timely care. This article provides an overview of frailty and its assessment in older people presenting to the ED. It discusses the most commonly used frailty assessment tool in the ED, the Clinical Frailty Scale, and identifies that the results of frailty assessment should be used to initiate appropriate individualised care in older patients.