ADHD is genetic. If you think they learned it somewhere, then that is a behavior disorder and not ADHD.
I used to see a counselor who had ADHD herself and treated mostly individuals with that problem, including myself, and she warned me to watch for ADHD in my daughter, saying that in was common for it to show up in the teen years. So, based on her opinion I would say yes it can show up after 10 years of age. I would guess that my counselor was pretty knowledgeable about ADHD, but I would still get a second opinion.
Sheckler does have ADHD.
No, he does not have ADHD.
adhd can not be treated and pills or patches can help to calm you down but not cure the adhd!
You do not need to go to a special school for ADHD. You can go to a regularschool if your ADHD is monitored.
Miley Cyrus does not have ADHD.
No ADHD is from birth.
what do teens with ADHD struggle with
adhd is not contagious so if you have it you were born with it
it depends on the level of adhd that you have
you are stuck with adhd your whole life