This book offers a thorough examination of frailty, covering its complexity through sections on foundational concepts, pathogenesis research, assessment methods, management strategies, care settings, its relation to other chronic conditions, and societal implications. It provides a deep understanding of frailty's scientific basis, advanced assessment tools, innovative management, and prevention approaches, and examines frailty within diverse care settings and in relation to other health conditions. By integrating multidisciplinary insights, it presents a holistic view of frailty, addressing its clinical, societal, and policy-related aspects, aiming to enhance well-being and inform clinical practitioners, educators, and policymakers. This book can serve as a reference guide with up-to-date information on frailty in older adults for geriatric medicine physicians, primary care clinicians, geroscience researchers, nurses, therapists (OT, PT, ST), and social workers.