MENA Newswire, CHICAGO: A 25-year research effort at Northwestern University has detailed a consistent pattern among a small group of adults in their 80s and beyond who retain memory performance more typical of people decades younger. The team studies “SuperAgers,” defined as individuals age 80 or older who meet stringent standards on episodic memory testing, including scoring at least 9 out of 15 on a delayed word recall measure, comparable to typical performance in people in their 50s and 60s.
Long-term research sheds light on why some adults over 80 retain exceptional memory performance.
Researchers said the long-running program, based at Northwestern’s Mesulam Center for Cognitive Neurology and Alzheimer’s Disease, has followed participants with annual evaluations and, in some cases, post-mortem brain donation. Since 2000, 290 SuperAger participants have taken part, and scientists have conducted autopsies on 77 donated SuperAger brains. The findings were summarized by program leaders in a perspective article reviewing the first quarter century of data and brain tissue analyses.
Across that body of work, the researchers reported two broad biological patterns that appear to help explain why some older adults maintain unusually strong memory. In some cases, SuperAgers showed resistance, meaning their brains did not develop the amyloid and tau protein buildups commonly known as plaques and tangles that are associated with Alzheimer’s disease. In other cases, the scientists described resilience, in which plaques and tangles were present but did not correspond to the degree of memory impairment often seen in typical aging and dementia.
Imaging and other assessments also pointed to brain structure that looks less affected by age-related change. The researchers reported that SuperAgers show no significant thinning of the cerebral cortex, the brain’s outer layer, and that a region called the anterior cingulate cortex can be thicker in SuperAgers than in younger adults. The anterior cingulate cortex is involved in integrating information related to decision-making, emotion and motivation, functions that can support attention and memory performance in daily life.
Social connection stands out in SuperAgers
Alongside the neurobiological findings, one repeated observation has been behavioral: SuperAgers tend to be highly social and report strong interpersonal relationships, even though their lifestyles vary widely in areas such as exercise habits. Northwestern researchers have described SuperAgers as often social and gregarious compared with peers who experience more typical cognitive aging, a pattern that has emerged repeatedly over years of interviews and follow-up evaluations within the cohort.
The program’s structure has allowed scientists to pair those behavioral observations with clinical testing that tracks memory and cognition over time. Participants are evaluated annually, and researchers said the combination of repeated cognitive measures and brain imaging has helped distinguish exceptional memory from short-term variation in test performance. Investigators have also used the long follow-up window to compare participants who maintain high scores with those who show more typical age-related decline.
Brain tissue studies add cellular clues
Post-mortem examinations added another layer of evidence, including cellular differences observed in donated brain tissue. Northwestern researchers reported that SuperAgers have more von Economo neurons, specialized cells linked in prior research to social behavior, and larger entorhinal neurons, a cell type considered critical for memory. The entorhinal cortex is a region involved in memory processing and is often affected early in Alzheimer’s disease, making cellular preservation in that area a focus of neuropathology studies.
Scientists involved in the program said brain donation has been central to identifying these microscopic features, allowing comparisons that cannot be made with living imaging alone. The research team emphasized that many reported findings emerged from donors who agreed to be followed for years and then provide tissue for detailed analysis after death. The program’s leaders have framed those contributions as essential to building a clearer map of what distinguishes superior memory in very old age.
The Northwestern team has said the SuperAging findings challenge the assumption that cognitive decline is inevitable and help define measurable traits that can be tracked in older adults. By documenting preserved cortical structure, distinct cellular features, and patterns of resistance or resilience to Alzheimer’s-related pathology, the program has assembled one of the most detailed portraits to date of superior memory in people 80 and older.