" The human brain is “under construction” throughout childhood and adolescence; in fact, the prefrontal cortex, which is responsible for good judgment, emotional regulation, impulse control, and other admirable “adult” qualities, is not fully mature until after the age of twenty! "

― Jane Nelsen , Positive Discipline: The First Three Years: From Infant to Toddler--Laying the Foundation for Raising a Capable, Confident Child