Cities across the world are growing older. Individuals aged 65 years or over are expected by mid-century to outnumber children under five by a ratio of two to one, and they will be living in an increasingly urbanized world, with 80 percent residing in low- and middle- income countries. These countries will also likely experience aging at a faster pace than has occurred in developed countries, and they will do so against a backdrop of underdeveloped infrastructure, lower levels of national income, and weaker social protection systems. But despite these challenges, aging is a predictable reality, so planning and the implementation of actions toward age-readiness are possible.