Scientists at Northwestern University have confirmed that a group known as SuperAgers, individuals over 80 years old, possess brains as sharp as those aged between 50 and 60. The cortex layer of SuperAgers’ brains is as thick as that of younger individuals, and in some areas like the anterior cingulate cortex, it is even denser than in younger adults. These brains show resilience, with either an absence of or tolerance to Alzheimer’s-causing proteins without impact on memory. Additionally, SuperAgers lead active social lives. Kathmandu, April 24. Memory decline is generally considered a natural consequence of aging, but researchers have identified a special group of people over 80 who maintain cognitive abilities comparable to those 30 years younger. For 25 years, investigators from Northwestern University have been studying this group, referring to them as ‘SuperAgers’. A recent report published in the journal Alzheimer’s & Dementia challenges the traditional beliefs about age-related cognitive decline, revealing that these individuals perform equally well on memory tests involving word recall as someone three decades younger.
The unique biological structure of their brains is what fascinates scientists the most. While aging typically leads to thinning of the brain’s outer layer—the cortex—SuperAgers maintain a cortex as robust as that in younger adults. Even more remarkable, the anterior cingulate cortex, responsible for decision-making and emotions, is sometimes denser than in younger individuals. Furthermore, these individuals display a high number of healthy neurons related to social behavior and memory functions (such as von Economo and entorhinal neurons).
Postmortem analyses of brains from 77 SuperAgers have highlighted two key mechanisms. First is ‘resistance,’ where some brains show a complete absence of the harmful protein plaques and tangles that cause Alzheimer’s disease. Second is ‘resilience,’ where despite the presence of these harmful proteins, there is no observable memory impairment. This suggests that SuperAgers’ brains have developed special capabilities either to withstand or combat such diseases.
Aside from biology, the lifestyle of SuperAgers is also noteworthy. They tend to be social, friendly, and enjoy engaging with others. While they may vary in exercise and diet routines, strong social relationships and active involvement appear critical in maintaining brain health. According to Dr. Sandra Ventresca, these findings could significantly contribute to developing new treatments and strategies aimed at preventing or delaying dementia and Alzheimer’s disease.
