Changes of Neural Connectivity with Aging and its Impact on Memory Decline

Memory loss is one of the most common cognitive concerns associated with aging, but the underlying neural mechanisms remain an important area of investigation. Emerging evidence suggests that age-related changes in brain connections, particularly within networks critical for memory and cognition, play a significant role in memory loss. This systematic review examines how brain connectivity changes with aging and how these alterations impact memory performance in older adults. The PubMed database was used to collect relevant literature from the past two years, focusing on studies that explored natural aging processes, brain connectivity, and memory loss. The review finds that aging is associated with structural and functional weakening of key brain networks, notably the default mode network (DMN), frontoparietal control network (FPCN), and hippocampal-prefrontal pathways. These changes contribute to slower processing speeds, impaired memory formation, and reduced executive function. However, the review also highlights that the aging brain retains notable plasticity. Physical activity, cognitive training, emotional stability, and metabolic health were found to preserve or enhance brain connectivity, supporting memory maintenance despite age-related decline. Contrary findings suggest that factors such as central obesity or emotional resilience may sometimes outweigh structural brain changes in determining memory outcomes. A key limitation of current research is the scarcity of longitudinal studies directly mapping how specific brain connections evolve with healthy aging independent of neurodegenerative disease. Future research should aim to clarify which neural pathways are most vulnerable over time and explore interventions targeting specific brain regions to preserve memory in aging populations.