I am a psychiatrist and what you describe does indeed sound like ADHD. He does need to see a professional but most men wont due to pride, ignorance and denial. You can try to get him to take some quizzes, see if you can get a Connors rating scale...the gold standard. The book that got most people aware of adult ADHD was Driven To Distraction, which is good and could help, although I had issues with the book being a bit overzealous in diagnosing people with ADHD that might have other issues. The military will treat people with psych medications once they have passed basic training without them. Some people refuse to either give or take stimulants, which remain the most effective meds, but there are some other options that can help.