Objective This study investigated the association between obesity, assessed using body mass index (BMI) and waist circumference (WC), and pre-frailty/frailty among older adults over 21 years of follow-up. <p>Design Prospective cohort study. <p>Setting Population-based study among communitydwelling adults in Tromsø municipality, Norway. <p>Participants 2340women and 2169 men aged ≥45 years ...