Childhood is typically viewed as a time of innocence and relative freedom from stress. In reality, though, almost 20% of children and 40% of adolescents experience significant emotional or behavioral disorders. Although major depression is more prevalent in adults, around 2.5% of children and more than 8% of adolescents suffer from the disorder. In fact, by the time they reach age 20, between 15 and 20% of children and adolescents will experience an episode of major depression. Children do not always display depression the same way adults do. Rather than showing the expression of profound sadness or hopelessness, childhood depression may produce the expression of exaggerated fears, clinginess, or avoidance of everyday activities. In older children, the symptoms may be sulking, school problems, and even acts of delinquency.