According to recent research, the brain finishes developing and maturing in the mid-to-late 20s. Although the brain stops growing in size by early adolescence, the teen years are all about fine-tuning how the brain works. The part of the brain behind the forehead, called the prefrontal cortex, is one of the last parts to mature. This area is responsible for skills like planning, prioritizing, and making good decisions. The rational part of a teens brain isnt fully developed and wont be until age 25 or so. The connections between the emotional part of the brain and the decision-making center are still developing in teens and not always at the same rate. The amygdala is where primitive emotions, urges, impulses, fears, aggression, and primitive desires are located, and adolescents and young adults rely on it to make decisions until the prefrontal cortex is fully developed.

In summary, the brain finishes developing and maturing in the mid-to-late 20s, and the prefrontal cortex, responsible for skills like planning, prioritizing, and making good decisions, is one of the last parts to mature. The rational part of a teens brain isnt fully developed and wont be until age 25 or so, and the connections between the emotional part of the brain and the decision-making center are still developing in teens and not always at the same rate.