Researchers have identified a striking biological difference in the aging brain that helps explain why some octogenarians stay mentally agile.

The research centers on a group called SuperAgers, extraordinary individuals eighty and older whose memory rivals that of people decades younger.

Researchers from the University of Illinois Chicago and Northwestern University released the findings, which could help explain why SuperAgers maintain cognitive resilience into advanced age.

These scientists have studied SuperAgers for years to understand what sets them apart.

Here's What They're Not Telling You About Your Retirement

In this study, they analyzed postmortem brain tissue, reviewing nearly 356,000 individual cell nuclei, with a focus on the hippocampus, a region essential for forming new memories and guiding learning.

The team compared tissue from SuperAgers, typical older adults, older adults with early dementia and younger healthy adults to map the differences across groups.

The central finding is that SuperAgers produced at least twice as many new neurons in the hippocampus as cognitively normal older adults and those with Alzheimer's pathology.

That enhanced neurogenesis appears to correlate with preserved cognitive function, suggesting a biological mechanism behind their memory resilience.

This Could Be the Most Important Video Gun Owners Watch All Year

Additionally, the researchers observed changes in brain support cells known as astrocytes and in critical memory neurons, particularly CA1 cells, that align with preserved cognitive ability. These shifts help explain why the aging brain can stay sharp even as other systems decline.

Genetic activity patterns in the brain also differed between SuperAgers and those affected by Alzheimer's disease.

"The study also showed that specific cells in the hippocampus show unique gene expression profiles that relate to neuronal function and transmission and are associated with superior cognitive function," Geula said.

SuperAgers have more immature neurons and neuroblasts in the hippocampus, which is an indication of stronger neurogenesis when compared with other groups, Geula said. "This observation aligns with a growing view that the aging brain retains plasticity and capacity for neuron formation," he added.

"We’ve always said that SuperAgers show that the aging brain can be biologically active, adaptable and flexible, but we didn’t know why," Gefen said. "This is biological proof that their brains are more plastic, and a real discovery that shows that neurogenesis of young neurons in the hippocampus may be a contributing factor."

"This is an important study because it may lead to certain cell gene treatments that could lead to more SuperAgers," the doctor said.

"It may also lead to more advanced testing to determine who will be a SuperAger and guide clinical treatment and management."

Geula cautioned that the study has limitations, primarily that tissue samples came from a single time point rather than ongoing observation.

He noted that human brain tissue studies typically involve fewer cases than animal research, which can complicate extrapolation.

"While these findings are not directly translatable to daily life and activities, they suggest cognitive resilience is associated with greater integrity of many brain systems," Geula said.

Thus, maintaining good overall health by keeping systemic diseases in check, maintaining a healthy diet and exercise, and ensuring the elderly remain mentally active assume more importance. The study was funded by the National Institute on Aging, which is part of the National Institutes of Health.