A groundbreaking study has identified five key stages in human brain development across the lifespan, highlighting that the adolescent phase extends until age 32. Researchers found that significant changes occur in the brain at ages 9, 32, 66, and 83, marking pivotal turning points in cognitive and emotional maturity. This new understanding suggests that adulthood, traditionally viewed as beginning in the late teens, actually starts much later, reshaping perceptions of life stages. Scientists emphasize the transformative rewiring and developmental shifts occurring throughout these critical epochs of human brain aging.