Sustainable cities and communitiesEvery person – in every country in the world – should have the opportunity to live a long and healthy life. Today, most people are living longer and a significant proportion of the world’s population are older people. By 2050, the world’s population of people over the age of 60 will double. This demographic change has strong implications for sustainable development. As people grow older, their health outcomes, needs and what they value can change (WHO).