Population aging and urbanization have exacerbated older people’s disadvantage in accessing public urban facilities. Identifying the influencing mechanism of spatial and non-spatial indicators on older (≥ 65 years old) adults visiting community parks may help to improve the Chinese community-life circle planning and healthy and active aging. The availability of mobile signaling data (MSD) and big geodata enables a community-level analysis of park accessibility among different age groups of older adults; such applications have been relatively scarce. The present study used MSD to analyze the differences between visits to community parks in central Shanghai by three groups of older people. The influencing mechanism of spatial and non-spatial factors was examined using a multivariate multiple linear regression (MMLR) model. The results revealed that older adults’ use of community park services scope was approximately 30%～50% lower than that of visitors overall. In addition, the ratio of local older people visiting community parks and visitors from different age groups shows significant diversity. Among spatial factors, travel distance was the most significant negative factor limiting older adults’ access to community parks, especially for those over 75 years old. The mixing degree of urban facilities was the most significant negative factor limiting local older adults’ access to community parks, especially for those aged 65～70. The findings also showed that socioeconomic attributes had a considerable positive impact on older adults’ access to community parks, especially for those over 70 years old. The present study might assist policymakers in understanding the spatial and non-spatial factors that influence park accessibility in the Shanghai metropolis and promote older people-friendly community park design and a healthy aging society.