This study adopted mobility theories to investigate the relationship between elderly people and public open space in Hong Kong. In doing so, qualitative methods, which are semi-structured interviews and (participant) observations, are adopted for the research methods. The data is collected from two Hong Kong areas, which are Wong Tai Sin District and Fanling / Sheung Shui New Town. The dataset consists of 4 files, including audio-recordings of interview, transcripts of interviews, photos from observation and videos from observation. There are 29 audio-recordings of interview (in Cantonese) and transcripts of interviews (in Chinese) respectively. For the imaging, there are 299 photos and 33 videos.