 This systematic review examined the effect of social relationships, social networks, and social support on cognitive function in healthy older adults aged 50 years and above. The authors found evidence suggesting a relationship between social activity, social networks, and cognitive function with social activity being associated with better performance in global cognition, overall executive functioning, working memory, visual spatial abilities, and processing speed, while social networks were linked to improved global cognition only. Additionally, social support was related to better performance in episodic memory and verbal fluency. Finally, the authors also found that a composite measure of social relationships, CMSR, was associated with better performance in episodic memory and verbal fluency. This article was authored by Michelle E. Kelly, Holly Duff, Sia Kelly, and others.