Donna Palumbo Until Quotations

We wouldn't interfere with infants or toddlers unless their behavior interfered with functioning, for example, if they were really aggressive. Most can do fine until ... they're around other children.

The frontal lobe of the brain, which controls these behaviors, matures until age 21. As children mature, some symptoms get better -- though they don't grow out of ADHD, as used to be believed, and half need treatment into adulthood.