Renovating old residential areas is crucial to address China's aging trend. Chongqing, with the second largest proportion of people aged above 65 in China, predominantly consists of high-density Gated Communities. It’s essential to clarify the priorities of suitable aging renovation in mountainous areas. A survey using the Housing Enabler tool assessed residential age-suitability among 819 older adults. Three major findings were derived. First, the three environmental barriers generated the most severe accessibility problems: stairs the only route in corridors, no grab bar at shower/bath and/or toilet, and wall-mounted cupboards and shelves placed high in kitchen. Secondly, fallers experienced twice as many accessibility problems compared to non-fallers. Third, housing built 20 years or more ago had 21.9% more serious accessibility problems than housing built less than 20 years ago. This might be useful for governments to evaluate the compatibility between older adults and communities and to set the priority for renovation. Furthermore, the dataset in this study possessed distinctive characteristics, including its origin in mountainous urban areas, a large sample size, gender balance, and applicability to gated communities, thereby supplementing critical data for the assessment of residential suitability for older adults.