Development is a process of change for the better. Development must also pay attention to the important things that support each of the development process itself. The problem that arises in development in general is that there are aspects that are disadvantaged. With the rate of population growth and the increase in human needs, development can have an impact on the environment being sacrificed as a result of fulfilling human needs while between humans and the environment there is a reciprocal relationship. One of the problems in development is that there are no child-friendly and elderly-friendly cities (age-friendly cities) as a whole in the regions of each province in Indonesia. For this reason, this research was conducted to examine the sustainable environment for age-friendly cities, especially in the islands by taking the case study of Tidung Island, the Thousand Islands. Based on the results of research conducted on Tidung Island, it is proven that Tidung Island still cannot be said to be an age-friendly city, this can be proven by the incomplete facilities that support the realization of an age-friendly city.

Keywords : Age Friendly City, Tidung Island, Sustainable Environment, Child Friendly City.