Between what ages does the brain reach its full size?

The correct age range for when the brain reaches its full size is typically around 23 to 25 years.

During the early development stages, a significant amount of brain growth occurs, particularly in early childhood and into adolescence. By the age of 9 to 10 and through the ages of 12 to 14, while there may be rapid growth and development, the brain is still undergoing critical changes and maturation that will affect its structure and function.

The final stages of brain development occur in the early twenties, particularly in the prefrontal cortex, which is responsible for critical thinking, decision-making, and impulse control. This area continues to mature and strengthen its connections throughout the early twenties, completing the brain's growth and reaching its full size around that age range. Understanding this developmental timeline is crucial in appreciating how maturity influences behavior and decision-making processes throughout these years.