How common is adult ADHD, really?

When most people think of ADHD (Attention Deficit Hyperactivity Disorder), they often picture a young child bouncing off the walls and struggling to focus in school. However, what many people don't realize is that ADHD is a disorder that can continue into adulthood. In fact, it is estimated that 4-5% of adults in the United States have ADHD, but the tru…