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by SkyBelow 2369 days ago
25 to 28 is when the myelination of the brain finishes.

https://www.sciencedirect.com/topics/medicine-and-dentistry/...

>Further myelination of subcortical and cortical tracts continues in the posterior to anterior direction well into the third decade of life, consistent with the time course of maturation of cognitive functions in children and adolescents.

Mish Shoykhet, Robert S.B. Clark, in Pediatric Critical Care (Fourth Edition), 2011