There is a Problem, and a Solution
ADHD is among the most commonly diagnosed neurobehavioral disorders of childhood and it’s estimated to occur in about three to five percent of American children. Contrary to popular belief that ADHD is over diagnosed, some researchers posit that adult ADHD is misdiagnosed or missed entirely because the criteria for it, as stated in the Diagnostic and Statistical Manual of Mental Disorders (DSM) is catered toward children and impractical for adults. In an article for WebMD, the researcher James J. McGough, MD, states that ADHD-impaired adults may not fit the criteria since it states some of the symptoms listed to fit it are "running and climbing incessantly". 
McGough believes that more appropriate diagnostic criteria for adults might be symptoms such as frequently missing appointments or driving too fast because adults don't generally climb things or run around the room when they have ADHD. Also, the requirement that someone with ADHD showed signs of hyperactivity, impulsivity, or inattentive behavior before the age of 7 is very difficult to determine by the time a person is an adult. Changing it to 16 or 18 is one of his suggested amendments to the DSM.
Counter intuitively, stimulant medications are best at reducing hyperactivity and impulsivity. They are not a cure-all however; therapy and behavior modifications are needed as well.
As stated in the useful article Hyperactivity and Impulsivity in ADHD: Your Child’s Bill of Rights, establishing a plan for counselors, family members, teachers, and friends' parents is the best approach at working to manage and offset the behaviors of an ADHD child. ADHD is a permanent condition; a person won’t grow out of it, but with a proactive treatment approach, they can lead fulfilling and successful lives.
To further blast a myth that ADHD doesn't exist, let's look at the facts about the ADHD brain. People with ADHD tend to have a smaller brain and abnormal brain chemistry. According to a study carried out by the Brookhaven National Laboratory and the Mt. Sinai School of Medicine, it was found that people with ADHD had lower levels of dopamine transporters in the brain's reward center than control subjects.