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This study investigates the mediating role of comfort (CMT), convenience (CNV), and aesthetics (AST) in the relationship between the enablers of an age-friendly built environment for walkability (BEW) and outcomes such as increased physical activity level (IPL), increased socialization (ISL), and improved quality of life (IQL) in older adults. The research follows a positivist paradigm using a quantitative approach and survey strategy with a cross-sectional design. A sample of 333 older adults was selected using the convenience sampling technique, and data were gathered through a self-administered questionnaire. Findings from hypothesis testing indicate that, among the enablers, age-friendly urban design policies (AUP) are the most significant construct, positively impacting all three mediating variables. Additionally, AST was found to have a significant positive effect on IPL and ISL, while CMT and CNV significantly influenced IPL and IQL, respectively. These results suggest implications for urban planners and policymakers to enhance the contribution of BEW toward IPL, ISL, and IQL for older adults, promoting sustainable design while ensuring inclusivity. This research offers valuable insights for academics and practitioners, emphasizing the importance of creating age-friendly environments to support the well-being and quality of life of older adults.