Built Environment Age-Friendly Optimisation Strategies: Promoting the Elderly Food Market Usage as an Example

City researchers support the elderly to actively enhance physical activities by intervening in built environments to benefit the healthy development of the elderly. The aim of this study is to propose built environment optimisation strategies to promote the physical activity level of the elderly. The research took the elderly food market usage in Dalian as an example, and divided the built environment into accessibility and attractiveness dimensions. The methods of combining the statistical quantitative analysis and qualitative comparative analysis were applied. We found that the spatial distribution density, the minimum distance of space, the type and the diversity of facility were key factors affecting usage frequency of the elderly food market. Furthermore, combinations of “the farmer market,” and the “high spatial distribution densities and rich types” had the high possibility and applicability to enhance activities of buying food in the region. Based on this, four optimisation models of built environments were proposed for promoting usage levels in the elderly. The findings of this study could match urban supply with the elderly’s needs, and it is a feasible way to provide fine design strategies for realisation of age-friendly cities.