when born with the person it becomes evident at a very early period of life
and has a very bad affect in as much as it renders him incapable of attending with constancy to any one object of attention.But it is seldom so great degree as to totally impede all instruction and what is very fortunate it generally diminishes with age.
Attention deficit hyperactivity disorder (ADHD) is a common neurobehavioral disorder most commonly diagnosed in children. According to the Centers for Disease Control and Prevention, the average age at diagnosis is 7. Boys are more than twice as likely to be diagnosed with ADHD than girls. Adults can develop symptoms and be diagnosed as well. It was originally called hyperkinetic impulse disorder. It wasn’t until the late 1960s that the American Psychiatric Association (APA) formally recognized ADHD as a mental disorder. Read more for a timeline of ADHD.