Researchers at Northwestern studied a group of octogenarians dubbed SuperAgers and found clear brain and lifestyle patterns that set them apart from typical aging. The work tracked nearly 300 people over 25 years and examined donated brains after death to tease out why some maintain memory like someone decades younger. The findings point to two routes to preserved cognition, structural differences in key brain regions, and social and intellectual habits that seem to matter. Those insights are shaping hopes for interventions that could protect against dementia.
SuperAgers are people 80 and older who score at least 9 out of 15 on a delayed word recall test, a level of memory usually seen in people 30 years younger. The Northwestern team followed a cohort of nearly 300 SuperAgers for about 25 years to identify shared characteristics and biological markers. By focusing on those who maintain exceptional memory late in life, the scientists hoped to separate age from inevitable decline.
The volunteers tended to be socially engaged and outgoing, with strong interpersonal relationships that kept them connected and mentally active. Researchers noted that continued socialization and intellectual engagement were common threads across the group. Those lifestyle patterns emerged alongside striking brain differences when tissue was examined after death.
The team studied 77 donated brains from SuperAgers and found a mixed picture when it came to the classic Alzheimer’s markers amyloid and tau. Some brains showed little to no buildup of those proteins, while others had plaques and tangles that surprisingly did not seem to impair cognition. “What we realized is there are two mechanisms that lead someone to become a SuperAger,” Weintraub said in the release. “One is resistance: they don’t make the plaques and tangles. Two is resilience: they make them, but they don’t do anything to their brains.”
Unlike most aging brains, SuperAgers did not show the expected thinning of the cortex, and they retained a thicker anterior cingulate cortex, a region tied to decision-making, emotion and motivation. The research also reported more von Economo neurons, which are linked to social behavior, and larger entorhinal neurons, which play a crucial role in memory. Those structural differences suggest a distinct neurobiological profile rather than just luck or lifestyle alone.
“It’s really what we’ve found in their brains that’s been so earth-shattering for us,” Weintraub said, reflecting on the team’s discoveries and the implications for how we think about aging brains. The paper was published as a perspective in Alzheimer’s & Dementia: The Journal of the Alzheimer’s Association, and the work received support from Northwestern’s Alzheimer’s Disease Research Center and the National Institute on Aging. That institutional backing helped sustain the long-term follow-up and the neuropathological analyses that made these comparisons possible.
Outside commentary reinforced the mix of biology and behavior. “The buildup of senile plaques — beta amyloid and tau — did not impact neuronal function in those who continued to do very well in terms of thinking, memory and decision-making,” one observer noted. “Those with positive outcomes shared continued socialization, interaction and a high level of intellectual engagement.” He concluded, “So the answer is a combination of genetic predisposition as well as continuing to keep exercising the brain like a muscle — both socially and intellectually.”
Armed with these patterns of resistance and resilience, researchers are exploring targeted ways to boost cognitive resilience and delay or prevent dementia. That includes looking for interventions that might preserve cortex thickness, support those specialized neurons, or amplify the protective effects of social and intellectual engagement. The work moves the field toward concrete strategies aimed at keeping brains capable well into advanced age.
