Terms in this set (10) at about what age does the brain become fully mature? During puberty, testosterone increases in both males and females. Suggesting that the human brain continues to grow and mature right up to the point when we become adults and. There are certain developmental periods where its more dynamic than others, such as the teenage years and young adulthood, he says. When is the brain fully mature? The brain continues to develop beyond adolescence. This brain region controls cognitive analysis and abstract thought, as well as corrective behavior in social situations. Magnetic resonance imaging (mri) studies have made it possible for scientists to watch the rate at which the pfc matures, and have discovered the male brain doesnt fully develop until age 25. brain maturity extends well beyond teen years under most laws, young people are recognized as adults at age 18. But emerging science about brain development suggests that most people dont reach. It doesnt matter how smart teens are or how well they scored on the sat or act. Good judgment isnt something they can excel in, at least not yet. The rational part of a teens brain isnt fully developed and wont be until age 25 or so. While no specific age has been identified as the age at which the human brain is fully mature, the washington post relates that many scientists agree that the brain does not reach maturity until at least the mid-20s. Some studies suggest that the brain continues to develop into the early 30s. Thats the age at which people can typically join the military and become fully independent.