SMRTR Science & EngineeringNov 25, 2025Nautilus

The Five Eras of the Human Brain

SMRTR summary

Scientists analyzed brain scans from over 3,800 people and discovered the brain develops through five distinct stages at ages 9, 32, 66, and 83, rather than aging gradually. These dramatic turning points involve major rewiring phases, with age 32 marking the strongest change when cognitive performance peaks before the brain settles into stability.

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