Brain plasticity, or the brain's ability to reorganize itself, continues to manifest throughout life but declines with age. While it does not completely disappear, its influence on specific skills, such as math ability, is limited. Genetics play a significant role in an individual's potential, as evidenced by experiences shared about training for physical activities like running marathons. The discussion highlights that practice is essential for improvement in skills like math; simply having neural plasticity is not enough to guarantee progress. For individuals who suffer brain injuries, recovery of cognitive functions often requires intensive therapy, and the extent of recovery can vary based on factors such as the severity of the injury and the individual's support system. Overall, while brain plasticity allows for some degree of learning and adaptation, it is not a catch-all solution for improving specific abilities without dedicated effort and practice.