My brother has classic ADHD, can't sit still for 30 minutes. He had learning difficulties, but finished college.
DD has ADD, struggled in school but has done fine, learned to manage as best she can.
Her spouse, DSIL, also with ADD. The two of them together are great procrastinators! But, they make a wonderful team. We just adjust our expectations on arrival times with them :-).
It's all good.
Many ADD/ADHD kids learn how to manage their symptoms by the time they are adults, and the medical profession is getting better about recognizing that you don't "outgrow it".
Give a Man a fish, he will eat for a day.
Teach a Man to fish, he will eat for a lifetime.