New Research Challenges Ideas About Aging and Memory
Many people think that forgetting things and losing mental sharpness are normal parts of getting older. However, new findings from researchers at Northwestern University suggest this doesn’t have to be true.
This groundbreaking 25-year study looked at the brains of “super agers.” These are individuals aged 80 and above who have excellent memory skills, comparable to those much younger.
Dr. Sandra Weintraub, the lead author of the study and a professor at Northwestern University Feinberg School of Medicine, explains that they coined the term “super ager” based on a specific score from memory tests. “We wanted to focus on memory because it is the most common concern among older adults,” she stated.
In their research, the scientists examined 79 donated brains from super agers. They found significant differences when compared to more typical aging brains.
Surprisingly, some of the super agers had brains with low levels of amyloid and tau proteins—substances usually linked to Alzheimer’s disease—while others had high levels but still maintained good cognitive health.
“We identified two groups among super agers,” Weintraub noted. “One group didn’t produce the harmful proteins at all, while the other group did produce them but remained mentally sharp.”
Typically older brains show thinning in the cortex, the outer layer responsible for decision-making and emotions. However, super agers did not display this thinning.
Additionally, researchers noted that super agers had a higher number of specific brain cells, known as von Economo neurons, which regulate social behavior. This group also had larger entorhinal neurons, crucial for memory.
Examining Common Beliefs
Dr. Weintraub pointed out widely held beliefs about aging often lead to assumptions about memory decline. “While cognitive scores generally decrease with age, individual differences can become more pronounced,” she explained.
If a family member is experiencing memory problems at 80, it might not be just aging but could indicate a health issue.
Christopher Weber, a director at the Alzheimer’s Association, expressed enthusiasm about the research. “These insights help us understand why some individuals resist age-related brain changes,” he said.
Despite the promising findings, Weber cautioned that the study’s participants were primarily well-educated and self-selected, which may not represent the broader population.
Taking Care of Your Brain
To improve brain health, Dr. Weintraub advises that behaviors beneficial for heart health are also good for brain health. “Eating well, getting enough sleep, exercising regularly, maintaining strong social connections, managing medical conditions, and avoiding harmful substances are all important,” she suggested.
Through understanding how some people manage to age successfully, researchers aim to develop better strategies for preventing cognitive decline.
This significant study was supported by the Northwestern Alzheimer’s Disease Research Center and the National Institutes of Health. The findings have been published in the journal Alzheimer’s & Dementia.
