Population ageing is a global phenomenon with major implications for cities. In OECD countries, the population share of those over 65 years old reached 17.8% in 2010, up from 7.7% in 1950, and is expected to climb to 25.1% in 2050. Cities are home to 43.2% of this older population. Cities can and must complement the efforts of national governments to address the consequences of this unprecedented demographic shift; they understand the needs and preferences of local communities and many of the impacts of ageing will be concentrated in space, presenting cities with specific problems and opportunities. Cities are also a locus for bridging across policy sectors to address the considerations for the ageing population in urban settings in an integrated fashion.