90-year-olds with 50-year-old memories aren’t genetically lucky. Their brains actively shield against risk – and we can learn to copy it.
The conversation around brain aging has started with one assumption: how much of our future is already written into our DNA?
If someone reaches their 90s with the memory of a person half their age, it’s easy to chalk it up to luck. Good genes. A fortunate hand dealt at birth. But a new study is beginning to chip away at that comforting explanation – and, in doing so, raises bigger questions for the longevity field.
Is ‘luck’ officially off the hook? If SuperAgers carry much the same inherited genetic risk for Alzheimer’s disease as everyone else, does this strengthen the argument that biology is far more dynamic than a fixed genetic script?
The findings also deepen another mystery. If these remarkable older adults aren’t simply avoiding disease, are they actively protecting their brains? And if so, what are those hidden shielding factors – and could tomorrow’s longevity interventions one day recreate them?
Then there’s an uncomfortable question for precision medicine itself. If today’s genetic risk tests can’t tell the difference between a cognitively average 90-year-old and someone whose memory rivals that of a much younger adult, are we placing too much faith in polygenic risk scores as crystal balls for healthy aging?
A new study published in Alzheimer’s Research & Therapy doesn’t answer all of those questions, but it makes one thing increasingly difficult to ignore: exceptional brain aging appears to be about much more than inherited genetics.
The people rewriting expectations of aging
Researchers have spent nearly two decades studying an extraordinary group known as SuperAgers – people in their 80s and 90s whose memory performs as well as, or even better than, adults in their 50s and 60s. They aren’t just doing well ‘for their age’. They’re outperforming what most of us assume aging inevitably looks like. Naturally, scientists wondered whether these individuals had simply won the genetic lottery.
“If that were true, identifying SuperAgers might be as simple as performing genetic testing rather than the comprehensive cognitive evaluations we currently use,” said Emily Rogalski, PhD, director of the Healthy Aging & Alzheimer’s Research Care (HAARC) Center at the University of Chicago, who established the definition of SuperAging in 2008 [1].
To test that idea, researchers from the HAARC Center and the Translational Genomics Research Institute (TGen), part of City of Hope, analyzed DNA from 142 SuperAgers and 89 cognitively average older adults across five research sites in the US and Canada.
They examined APOE – the gene most strongly linked to Alzheimer’s risk – as well as broader polygenic risk scores, which combine thousands of tiny genetic variations into a single estimate of inherited disease risk.
Think of those scores as a weather forecast rather than a fixed destination. They can suggest the likelihood of storm clouds, but they can’t tell you exactly what the day will look like. That distinction turned out to matter.
Genes weren’t the separating line
The researchers found that SuperAgers were no different from their peers when it came to inherited Alzheimer’s risk.
Whether they looked at APOE or more comprehensive genetic risk scores, the results were essentially the same: genetics alone could not explain why some people retained exceptional memory decades into later life.
“The findings reinforce that preserving cognitive health involves more than reducing Alzheimer’s disease risk alone. Understanding the biological, behavioral, and social factors that promote exceptional cognitive aging may ultimately complement traditional disease-focused approaches and help inform more personalized strategies for supporting brain health across the lifespan,” said Ana Capuano, PhD, co-first author and director of the biostatistics core at the HAARC Center.
The team also searched for rare genetic variants previously linked with resilience against Alzheimer’s disease but found no meaningful differences there either.
For Matt Huentelman, PhD, professor and director in TGen’s Early Detection and Prevention Division, that marks an important boundary for genetics.
“Common genetic risk factors captured by APOE and current polygenic risk scores do not explain the SuperAging phenotype. Future work should move beyond disease-risk models and investigate the broader biological, environmental, and experiential pathways that contribute to exceptional cognitive aging,” he said.
The search shifts from risk to resilience
For decades, aging research has largely been about identifying what goes wrong. Which genes increase risk? Which biomarkers predict disease? Which pathways eventually fail? But avoiding illness isn’t necessarily the same thing as building resilience.
Scientists now believe the next chapter of research will require looking at the whole person rather than isolated genes. Future studies will combine brain imaging, blood biomarkers, immune profiling and genetics with everyday factors like sleep, physical activity, social engagement and environmental exposures.
“For many years, aging research has focused on identifying factors that increase the risk of disease,” said Ignazio S Piras, PhD, associate professor in TGen’s Early Detection and Prevention Division. “Those studies are critically important, but the absence of risk factors does not necessarily mean someone possesses the protective factors that support exceptional brain health. This study helps demonstrate that distinction.”
Why longevity should pay attention
Genetic testing remains a valuable tool, but this study is a reminder that DNA is only one chapter of a much longer story. Polygenic risk scores may identify vulnerability, yet they appear far less capable of identifying exceptional resilience.
If future research can uncover the biological ‘shielding factors’ behind SuperAgers, those discoveries could influence everything from therapeutics and preventive medicine to lifestyle interventions designed to preserve cognitive health across the lifespan.
Perhaps luck isn’t entirely off the hook, but it may deserve less credit than we once thought. Perhaps DNA isn’t destiny so much as a starting point. And perhaps the next breakthrough in longevity won’t come from finding people with the lowest genetic risk, but from understanding how ordinary genes can produce extraordinary brains.
