My husband is almost 50 and is still ADHD!
He is an adult ADHD.
You do not grow out of it, you learn techniques to cope.
He says that your son will need to be taught exactly what is expected for behaviors, school and work... And then he will need to be reminded, until he can attempt to even try to find a way to remind himself what he is supposed to be doing..
We have been married almost 30 years and I have known my husband since 7th grade. I am very aware, my husband will NEVER have the concept of time... It is non existent to him. He uses his iphone, his casio watch and his computer when I am not around to keep him on task. He has to write things down and post them everywhere to remind himself.
What is interesting is, my husband can pretty well keep all of his stuff organized at work, he is a purchasing director for a major city dept. but once he leaves, he just lets all of that organization go. Because everyday is different and he does not have to sit at a desk all day, he copes. He also finds if he can exercise it helps him clear his mind and work though thoughts. Swimming, running, biking seem to work best for my husband.. Also creative projects are soothing to him.
You will need to work with your son to figure out, what type of system works for HIM. He needs to understand that most other people remember things in their own minds, but he will do better with visual cues or audio cues. He must take his medication to get through a successful day, but when he comes home, be prepared to be his "gentle stay on task master"..
My husband say ADHD is like a constant stream of information running through your brain all at once with no commas..
He says this is an example of this morning
I need to be at work what will I wear since I want to ride my bike did I have a burger yesterday or was I thinking about going to lunch with Mike he said he was going to the coast I wonder if dad remembered that I need to borrow the saw to cut down the.. my bike has a flat I will need to drive do I have an appointment or lunch what was the cat doing over there I need to take a piece of fruit. Where are my keys I need to feed the cat these cloths are not clean I need to get my check book.
Pretty amazing that they can function. It will take some tweaking of his medication and remember as he grows, his meds will need to be adjusted. Is your son listed as ADHD at school? He can be given extra time to complete tasks and take tests, so that he is not penalized. Also send anote to each of his teachers to let them know you want to be informed of any difficulties your child is having..