Key Takeaways

Scientists identified four major ages when brain rewiring occurs

Researchers said brain development isn’t one linear progression, it changes in stages

These shifts may help explain when mental health conditions begin

WEDNESDAY, Nov. 26, 2025 (HealthDay News) — From childhood to old age, the human brain doesn’t just slowly fade or steadily grow, it changes in stages.

A new study suggests our brains go through four major turning points that shape how we think, learn and connect.

Researchers said those shifts happen around the ages of 9, 32, 66 and 83.

The findings, published Nov. 25 in the journal Nature Communications , show that brain development isn’t a straight path. Instead, it moves through different “epochs,” or stages, where the brain’s network of connections

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