This guide provides information and recommendations for making cities more age-friendly. It was developed based on research conducted in 33 cities across the world to understand the experiences of older residents. Focus groups with older adults, their caregivers, and service providers identified common features of cities that either facilitated or posed barriers to active aging. The results informed a checklist of age-friendly city features to guide urban planning and development. The goal is to help cities support the health, participation, and security of older residents as populations age.