Aging in place can be a challenge for seniors living in cities, where the infrastructure and associated services are typically designed for the working population to enhance efficiency and productivity.Through surveying community-dwelling seniors, we ask these research questions: How is the neighborhood environment related to the physical and mental health of seniors living in Hong Kong, Singapore, and Tokyo? How can we make cities more age-friendly to encourage aging in place? To answer these research questions, both observational and questionnaire surveys are used. Characteristics of the local neighborhood are captured by individual-based and general local characteristics. Multilevel analysis is used to disentangle the effects of factors ...