Urbanization and population aging are two key phenomena in the twenty-first century that concerns the elders living in cities, especially those in low- and middle-income countries like Sri Lanka. In such a setting, understanding the responsiveness of the built environment for active aging is crucial. However, even the few available studies are prioritized on health rather than the built environment attributes. Therefore, this study aims to assess the built environment attributes related to

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... s, for the first time, in developing countries like Sri Lanka. The assessment method composes of two case studies in Colombo, Sri Lanka with a questionnaire survey, an axial map, and a frequency analysis using the SPSS software. The case studies comprise of a middle-income and a low-income settlement both with high population density. The analysis results explicitly informed that, in comparison, the middle-income settlement is more adversely affected by the built environment response related to health and social relationships. This finding is further supported by the prominence in health-related issues of loneliness (ρ-value .042) and lack of freedom (ρ-value .014) in the middle-income settlement. The built environment attributes were ranked based on their significance in correlation with the Quality-of-Life measures and the individual age-related characteristics. This was further developed for an appraisal that assesses health-related aspects of built environment response for vulnerable age groups like elders. The findings and the appraisal could support the future decision-making process of the National health budget and future urban design interventions since Sri Lanka has the highest South Asian aging population.