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Why do brain cells stop growing after 18 years?

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Adult brain cells do keep growing according to new study We start losing neurons (brain cells) almost immediately after birth with very few neurons ever forming during our post-birth lives. read more

Neurons continue to grow and change beyond the first years of development and well into adulthood, according to a new study. The finding challenges the traditional belief that adult brain cells, or neurons, are largely static and unable to change their structures in response to new experiences. read more

Well in terms of size it stops growing earlier than that. But it keeps changing throughout life. All learning is brain change, everything that you experience changes your brain. The number 25 comes from the fact that development (I guess myelination is the metric they use) of the last cortical area, the prefrontal cortex (PFC), finishes at about 25. read more

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