for type iii cities young cities ageing slowly where the demographic change will have an impact further in the future indicators will be narrower in scope and their implementation may increase as demographic change progresses the who defines an agefriendly city as an inclusive and accessible community environment that optimises opportunities for health participation and security to ensure quality of life and dignity as people age to understand how agefriendly a city is and to compare it internationally indicators can help explore the effect of the relevant policies after they are implemented