This research was published in the January 2013 journal Pediatrics and sponsored by CHADD. It followed 551 teens with ADHD from ages 14-16 until they turned 37 years old. They found that the ADHD adults had twice as many health problems, more than twice as likely to have mental health issues, 5x as likely to have antisocial personality disorder, twice as likely to have impaired work performance and three times as likely to have financial stress.
There was a very interesting quote from the researcher. David W. Brook, M.D., professor of psychiatry at NYU School of Medicine: “We think it has to do with impaired difficulty in the parent-child relationship when they are teens.”
Perhaps this indicates that parents who are raising a challenging ADHD teen should reach out for professional support in order to best help their child. (My conclusion, not from the article or the study.)