Dr Russell Barkley seems to be pretty against the idea of not taking meds. ADHD affects all parts of your life, and just because you don't have school doesnt mean you dont have ADHD. Your brain works better on the drugs, you can be more responsible, put more effort into your hobbies, and take better care of yourself if youre on your meds.
Unless theyve got some real reason for suggesting that, you should probably get a new dr.