Population ageing raises growing concerns over mobility and independence, particularly in rapidly urbanising contexts. While existing studies often emphasise health factors, limited attention has been given to the role of environmental barriers in shaping mobility dependency. This study examines how built environment constraints and health-related limitations influence mobility dependency among older adults in urban Malaysia. Using survey data from 450 respondents, an ordered logistic regression model is applied to analyse three levels of dependency. Environmental barriers are measured through composite indices of pedestrian walkways, crossings, building accessibility, and public space quality, while health factors include walking difficulty, visual impairment, chronic illness, and use of mobility aids. The results indicate that pedestrian walkway barriers significantly increase the likelihood of higher mobility dependency. Walking difficulty and use of mobility aids also show strong positive effects. In contrast, other environmental and general health factors are not statistically significant. Overall, the findings highlight the critical role of pedestrian-level environments in shaping mobility outcomes, underscoring the need for age-friendly urban planning that prioritises safe and accessible walking infrastructure.