It is believed that having a thicker cortex, the areas of the brain that deal with judgment and complex thought, is a good thing, and recent studies have found that childhood intelligence has a lot to do with the development of the cortical tissue. So when your parents yelled at you because you were not working hard enough in school, they were really preparing you, not for college, but for old age.
From healthland.time.com:
Brain Aging May Depend On Childhood Intelligence
Brain Aging May Depend On Childhood Intelligence was last modified: June 14th, 2013 by