It is never too late to turn a life around. It will be tough at his age, because of learned helplessness and already being in a bad pattern, but it’s possible and totally worth it. What you’re experiencing now is untreated ADHD — which carries risks like criminality, anxiety, depression, substance abuse, etc.
The diagnosis is the first step; now it’s time for treatment. That should include some or all of the following: medication, healthy diet and supplements, exercise, therapy/behavior modification, accommodations in school, ADHD Coaching or Tutoring, etc.
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism