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Brains Don't Enter Their 'Adult Era' Until Well After 30, Study Finds

You might have heard that the brain doesn’t mature fully until 25, though there’s little to no evidence to support this oft-repeated claim. And personally, the results of a recent study, published in Nature Communications, make a lot more sense to me. After looking at over 4,000 brain scans from participants aged zero to 90, researchers found that our minds seem to enjoy five “eras”, separated by four turning points which appear, on average, to happen at roughly the same ages.The brain’s developmental shift to adulthood seemed to happen well after 30. Dr Alexa Mousley, who led the research, told Cambridge University: “Looking back, many of us feel our lives have been characterised by different phases. It turns out that brains also go through these eras”. When do the brain age shifts happen?Per the 2025 paper, the brain goes through five developmental phases in our lifetimes: childhood (from birth ’til about 9), adolescence (9-32), adulthood (32-66), early ageing (66-83), and late ageing (83 onwards). That’s right – our mind’s adult phase, the longest era, was found to begin years after our 30th birthday.“Around the age of 32, we see the most directional changes in wiring and the largest overall shift in trajectory, compared to all the other turning points,” Dr Mousley said. “While puberty offers a clear start, the end of adolescence is much harder to pin down scientifically. Based purely on neural architecture, we found that adolescent-like changes in brain structure end around the early thirties.”The “adult” period seemed to be characterised by a “plateau in intelligence and personality”, more stability across the brain, and the increased compartmentalisation of different regions. What might this research mean? “We know the brain’s wiring is crucial to our development, but we lack a big picture of how it changes across our lives and why,” Dr Mousley shared. “These eras provide important context for what our brains might be best at, or more vulnerable to, at different stages of our lives.“It could help us understand why some brains develop differently at key points in life, whether it be learning difficulties in childhood, or dementia in our later years.”Personally, though, I’ve already found a use case for the research: it’ll help me to justify my interest in Twilight rewatches and dubious tattoos for a precious couple more years, even if it’s just to myself.Related...Boosting A Protein May Clear Dementia-Linked Plaques 'Like A Vacuum Cleaner'Emma Thompson's Right – Writing By Hand Is Great For Our BrainsScientists Think These Brain Changes May Link Insomnia To Dementia

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