This paper seeks to develop our understanding of neighbourhood boundaries, as defined by older people. Using interview and mapping methods, research revealed the significance of three factors ‒ built-form pattern, spatial distribution of the social networks and personal attributes ‒ as contributing to how older people define their neighbourhood boundaries. Research findings highlighted discrepancies between residents’ perceived neighbourhood boundaries and the statistical unit used as the neighbourhood proxy in most neighbourhood-related research. The findings suggested that the statistical information about the neighbourhood effects on older people does not necessarily reflect the lived experience of older people in their perceived neighbourhood.