After 25 years of studying people in their 80s and 90s with unusually strong memories, researchers are finding that social connection may be one of the clearest clues — but biology appears to matter just as much.
Some Brains Age Differently
Aging doesn’t affect every brain the same way. For most people, memory gradually becomes less efficient with age — the numbers illustrate this starkly: on a standard word-list recall test, the average person scores around 9 out of 15 words in their late 50s to mid-60s, but that average score drops to roughly 5 out of 15 by age 80. A small group of adults resists nearly all of that decline.
Researchers at Northwestern University call them “SuperAgers” — a term coined in the late 1990s by neurologist Dr. M. Marsel Mesulam, who founded the university’s Mesulam Institute for Cognitive Neurology and Alzheimer’s Disease and helped launch the research program that has tracked this population ever since.
A new paper, published August 7, 2025, in Alzheimer’s & Dementia: The Journal of the Alzheimer’s Association — authored by Sandra Weintraub, Tamar Gefen, Changiz Geula, and Mesulam himself, and released as part of a special issue marking the 40th anniversary of the NIA’s Alzheimer’s Disease Centers Program — summarizes everything the Northwestern SuperAging Program has learned across its first quarter-century.
The findings challenge a long-standing assumption: that meaningful cognitive decline is simply an unavoidable cost of getting older. Some brains, it turns out, are remarkably resistant to that decline — and the explanation runs considerably deeper than diet, exercise, or any particular supplement.
What Makes Someone a Super-Ager?
The Northwestern program’s bar is genuinely demanding. To qualify, a participant must be at least 80 years old and score on a delayed word-recall test at a level matching adults two to three decades younger — meaning a SuperAger candidate in their 80s needs to perform like someone in their 50s or 60s on the very test where most people show real decline by that age. Over 25 years, the program has enrolled a substantial cohort of these high-performing older adults, with a meaningful subset agreeing to brain donation after death — giving researchers a rare, direct look at what these unusually resilient brains actually look like at the cellular level, not just how they perform on cognitive tests during life.
The result isn’t a single “SuperAging gene.” It’s a distinct biological pattern the researchers now describe as a genuine neurobiological phenotype — a specific, identifiable brain profile, not simply the healthy tail end of a normal aging curve.
The Social Connection Stands Out
Among the behavioral traits the research turned up, one recurs consistently: SuperAgers tend to be highly social. Compared with cognitively typical peers of the same age, they’re more likely to describe their relationships positively, to place real importance on maintaining social connections, and to score higher on measures of extraversion.
That doesn’t prove socializing itself prevents cognitive decline — but the consistency of the pattern has made social connection one of the most compelling threads in the broader SuperAging puzzle, and it has a plausible biological basis. Humans are inherently social creatures, and maintaining real relationships demands sustained attention, communication, emotional processing, and memory working together continuously. A socially engaged life may function as an ongoing source of cognitive and emotional stimulation that a more isolated life simply doesn’t provide.
The Brain Itself Looks Different
The more striking findings, though, show up directly in brain structure rather than behavior. The Northwestern research found that SuperAgers’ cortical volumes are essentially indistinguishable from those of neurotypical adults 20 to 30 years younger — a level of preservation their same-age peers, who typically show real age-related cortical thinning, simply don’t share.
One region stood out even more: a specific area within the cingulate gyrus was actually thicker in SuperAgers than in the younger neurotypical comparison group — not just preserved, but measurably larger than in people decades their junior. That region is tied to motivation, emotion, attention, and social behavior, which raises a genuinely interesting possibility: the social engagement so common among SuperAgers may not be purely a lifestyle choice layered on top of ordinary biology. It could partly reflect real structural differences in how their brains are built and maintained in the first place.
Their Brains Also Show Fewer Signs of Alzheimer’s Pathology
The research also examined the cellular hallmarks associated with Alzheimer’s disease directly, through post-mortem analysis of donated brains. SuperAgers showed markedly fewer Alzheimer’s-type changes than would typically be expected at their age, along with larger entorhinal neurons, fewer inflammatory microglia in white matter, and better-preserved cholinergic innervation — the neurochemical system central to attention and memory function.
Together, these findings point toward two distinct, complementary phenomena: resistance to age-related brain damage in the first place, and resilience even when some of that damage does occur. That distinction matters scientifically — a brain can encounter some of the biological hallmarks associated with aging without necessarily developing the cognitive impairment those changes usually produce. As Weintraub put it in describing the findings: “Our findings show that exceptional memory in old age is not only possible but is linked to a distinct neurobiological profile. This opens the door to new interventions aimed at preserving brain health well into the later decades of life.” SuperAgers, in that sense, offer researchers something close to a natural experiment: what specifically allows some brains to keep functioning at a high level despite the biological pressures every aging brain faces?
The Mystery of von Economo Neurons
One of the more unusual threads in this research involves a rare cell type called the von Economo neuron — a specialized cell linked to highly social behavior, found almost exclusively in humans and a small number of other highly social mammals. SuperAger brains showed a greater density of these cells in specific regions, and researchers suspect they may be connected to the unusually strong social networks and interpersonal engagement so consistently observed in this population.
But the evidence doesn’t establish simple, one-directional causation. The neurons could contribute directly to social behavior. Social behavior, over years, could help maintain brain structure. Or both patterns could simply be downstream expressions of some deeper, shared biological trait. That question remains genuinely open in the research.
There Is No Perfect Super-Ager Lifestyle
Perhaps the most practically useful finding from this research is what SuperAgers don’t have in common. Researchers didn’t find one universal diet, one shared exercise routine, or a common medication regimen — and some participants didn’t follow conventional health advice particularly closely at all. Some exercised regularly; others didn’t. Some maintained textbook-healthy habits; others carried habits that would typically be considered unfavorable for long-term health. That doesn’t mean lifestyle is irrelevant to healthy aging generally — it means lifestyle alone clearly doesn’t explain why this particular group maintained exceptional memory into their 80s, 90s, and beyond.
The Chicken-and-Egg Problem
There’s a real scientific puzzle embedded in the social-connection finding: do social relationships actively help preserve brain function, or do people whose brains are already functioning better simply find it easier to stay socially engaged in the first place? The researchers are explicit that this direction of causality remains unsettled. Someone experiencing early cognitive decline may naturally withdraw from social life without consciously choosing to; someone with strong memory and attention may simply feel more motivated to stay socially active. Untangling the two is genuinely difficult, and it’s entirely possible both processes are happening simultaneously and reinforcing each other over time.
What About Loneliness?
The inverse pattern matters too. Broader research well beyond this specific program has linked long-term social isolation and loneliness to worse health and cognitive outcomes generally, with chronic stress and its physiological effects on the brain proposed as one likely pathway. Still, the SuperAger research shouldn’t be read as proof that loneliness causes dementia, or that socializing alone prevents Alzheimer’s disease — the actual evidence is more nuanced than either claim. Social connection looks like one meaningful component within a much larger, interacting biological system, not a standalone protective mechanism on its own.
Genetics May Be Part of the Story
The Northwestern researchers increasingly frame SuperAging as a distinct neurobiological phenotype rather than simply a lucky collection of healthy habits — meaning genetics, brain structure, cellular biology, environmental exposure, and behavior likely all contribute simultaneously. The researchers specifically point to a long list of interacting factors known to influence brain aging generally, including genetic background, nutrition, chronic inflammation, exercise, blood pressure, infectious disease history, education, and psychosocial circumstances. That complexity helps explain why there may never be a single, universal “SuperAging formula” — two people following nearly identical lifestyles can still end up on very different brain-aging trajectories.
The Bigger Lesson About Aging
This research reframes the central question researchers are asking. Instead of only asking how to slow brain aging generally, scientists can now also ask why certain brains resist it so effectively in the first place. That shift could eventually open the door to genuinely new approaches to protecting memory — if researchers can pin down which specific biological mechanisms allow some people to maintain unusually strong cognitive function, those mechanisms become concrete targets for future intervention, as Weintraub’s own comments suggest the team is already thinking about. The goal isn’t necessarily turning everyone into a SuperAger. It’s understanding which forms of cognitive resilience are actually biologically achievable, and for whom.
Socializing Is Not a Magic Prescription
There’s an easy but oversimplified takeaway lurking in all of this: “go out more and you’ll protect your brain.” The evidence doesn’t support that leap. Nothing in this research shows that simply increasing social activity will transform an ordinary older adult into a SuperAger — the researchers themselves consistently point toward a genuine combination of biology and behavior, not one isolated lifestyle fix. What social connection realistically offers is more modest and more honest: it appears to be one of the behaviors associated with the kind of brain resilience seen in this exceptional group, and it’s also something that improves quality of life on its own terms, regardless of whether it ultimately changes the trajectory of cognitive aging for any individual person.
The Future of Brain Aging Research
The first 25 years of the Northwestern SuperAging Program have produced a genuinely unusual portrait of what healthy cognitive aging can look like at the extreme end of the distribution. SuperAgers tend to maintain stronger brain structure than their peers, show fewer signs of certain age-related pathology, carry distinctive cellular characteristics, and are frequently, notably engaged with other people. None of these findings amounts to a guaranteed formula for avoiding dementia. But together, they challenge the assumption that cognitive decline has to follow one predictable, universal path as people age.
The aging brain may be considerably more resilient than scientists once assumed — and perhaps the most important discovery here isn’t that SuperAgers found some secret to staying young. It’s that some brains appear to carry genuine biological defenses against aging that researchers are only now beginning to understand in real mechanistic detail. As the Northwestern team’s work suggests, the next real breakthrough may come not from asking how to help everyone simply live longer, but from figuring out why some people’s brains remain remarkably capable well past the age at which decline is generally expected to set in.
