As people sixty-five and older constitute an ever increasingly proportion of population in most industrialized nations, the design of housing and other built provisions needs to be rethought in order to accommodate this ever-expanding ageing population. how can far-reaching architectural solutions play a key part by creating sustainable cities for the changing profile of the population, reducing models of dependency for care and transport while creating opportunities for recreation, leisure and work? this issue reflects on the population challenges facing europe, australia, north america, and asia, offering innovative responses to these problems on a practical and speculative level.