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What age does the brain have the most neurons?

By the fifth month of gestation, the human brain has produced most of the 100 billion neurons it will have for a lifetime. The answer to **what age does the brain have the most neurons** is surprising to many, revealing that our peak count occurs before we are even born, during the earliest stages of development. This initial, rapid production is just the beginning of a dynamic and lifelong process of neural refinement.