The average age of ADHD diagnosis is 7 years old. Attention-deficit hyperactivity disorder, or ADHD, is a condition that makes it unusually difficult for kids to concentrate on tasks, to pay attention, to sit still, and to control impulsive behavior ADHD … Symptoms of ADHD typically first appear between the ages of 3 and 6.

5 fast facts Males are almost three times more likely to be diagnosed with ADHD than females. During their lifetimes, 13 percent of men will be diagnosed with ADHD.