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Understanding Brain Changes: Which of the following is not true regarding brain development and aging?

Brain volume starts to decrease subtly around age 30 or 40, with the rate of shrinkage potentially accelerating after age 60. This fact highlights that the brain is in constant flux throughout life, which is a key concept to understanding which of the following is not true regarding brain development and aging. The common misconception that the brain uniformly declines is false, as some cognitive functions actually improve or remain stable with age.