 This study aimed to systematically review and quantify the correlations between built environment attributes and physical activity, PA, in older adults, greater than or equal to 65 years old. The findings suggest that walkability, safety from crime, overall access to destinations and services, recreational facilities, parks or public open space, shops or commercial destinations, greenery and aesthetically pleasing scenery, walk-friendly infrastructure, and access to public transport are positively associated with PA. However, the strength of evidence for these associations varies depending on the type of PA and environmental measurement method used. The study highlights the importance of designing safe, walkable and aesthetically pleasing neighborhoods that provide easy access to a variety of destinations and services to promote healthy and active aging in older adults. This article was authored by David W. Barnett, Anthony Barnett, Andrea Nathan, and others.