Almost from the time when ADHD was defined and listed as a condition, it has been thought of as a childhood condition.
Somehow, people thought you grew out of it, some people still do!
Point is, ADHD is a neurological condition - in other words you are born with it, and you will die with it. The best we can do is learn how to manage the traits - in other words we need to maximise the beneficial ones, and diminish the negative one.
ADHD is highly heritable, four out of five children who have ADHD have at least one parent with the condition. Height is the only genetic factor that is passed onto children more than ADHD!
Parenting is very important when it comes to ADHD!
The fact that so many ADHD children have parents who also have ADHD means that parenting can be very difficult too. Luckily the parents who have a good understanding of their condition are usually the best parents for their children.