![]() ![]() Neurons are fragile and can be damaged by pressure, stretching, or cutting. Recent brain research indicates that birth to age three are the most important years in a child’s development. What age is most important for brain development? But emerging science about brain development suggests that most people don’t reach full maturity until the age 25. Under most laws, young people are recognized as adults at age 18. At what age is the brain fully developed? To arrive at the more than 100 billion neurons that are the normal complement of a newborn baby, the brain must grow at the rate of about 250,000 nerve cells per minute, on average, throughout the course of pregnancy. How many neurons does the brain have at birth? ![]() Our brains have about 86 billion neurons. Neurons are the tiny processing units within the human brain and nervous system.
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