Welcome to the 70–90 Club podcast. This is Laura Artman and today I’m talking about your brain, and what happens to it as the years go by.
Here’s the big question. As more of us are living longer, how do we protect our thinking and memory? To answer that, researchers turned to one of the most famous long-running health studies in the country, the Framingham Heart Study. They looked at brain MRIs from more than 2,200 men and women in Framingham, Massachusetts.
These were everyday community members, ages 34 to 97. Not a small group of patients picked from a clinic, but a broad slice of real people. That matters, because it gives us a much more accurate picture of what normal aging looks like.
For the final analysis, they focused on 2,081 people who had no dementia, stroke, multiple sclerosis, or other chronic neurological conditions. So what did they find?
First, age matters. Age alone explains about 50 percent of the differences in total brain volume. Before age 50, those differences are small. After 50, brain volume begins to decline substantially.
Second, the decline isn’t the same everywhere in the brain. The frontal lobes showed the greatest loss, about 12 percent. The temporal lobes declined roughly 9 percent. The occipital and parietal lobes showed only modest changes.
Third, men and women. Men have larger total brain volumes than women, but once researchers corrected for head size, that difference was no longer significant. Gender differences in specific regions were small overall. The exception was the frontal lobe, where men had significantly smaller volumes across the entire age range studied.
Now, here’s the finding I want you to remember.
Brain infarctions, which are areas of tissue damaged by blocked blood flow, were common after age 50. And they increased steadily with age. These infarctions were linked to larger white matter hyperintensities, which are changes seen on MRI in the brain’s white matter.
Among men, an infarction was also tied to greater loss of total brain volume. And the size of the infarct was associated with smaller volumes in nearly every brain measure the researchers examined. What does this tell us? That cerebrovascular disease, problems with the blood vessels of the brain, is common as we age, and it goes hand in hand with a smaller brain.
The researchers also point out something hopeful. Many of the health risk factors tied to faster brain aging can be influenced through medications or behavior changes. That opens the door to prevention. So here’s your takeaway. Brain aging is real, it picks up after 50, and it affects some regions more than others. But the blood vessels that feed your brain are part of the story, and that’s the part we may be able to do something about.
Thank you for listening to the 70-90 Club.
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