To promote healthy, active aging, the age-friendly community initiative has evolved in Canada, Spain, Brazil and Australia, among other countries. An age-friendly community provides accessible and inclusive built and social environments where older adults can enjoy good health, participate actively and live in security. The rapid expansion of the initiative in all states can largely be explained by common key activities undertaken by the state, municipal and –in the case of Canada– also federal, governments. These initiatives include strategic engagements and policy action in all states, and knowledge development and exchange in Canada in particular. Strategic engagements involve creating or strengthening collaborative intersectoral relationships to access multiple arenas of decision-making, and addressing all areas that constitute an age-friendly community. With variations across states, policy actions have included the following: declaring the initiative as an official policy direction; establishing model cities to be emulated by other cities; funding community projects; implementing consistent methodology; evaluating implementation, enhancing public visibility, and aligning age-friendly community policy with other state-level policy directions. To stimulate knowledge development and exchange, Canadian efforts have included the creation of a community of practice and of a research and policy network to encourage the development and translation of scientific evidence on aging-supportive communities. These activities are expected to result in a strong and durable integration of older persons’ views, aspirations, rights and needs in municipal, as well as state, planning and policy.