The good news is that medication may mitigates the symptoms so you can focus on driving or flying safely.

The bad news is the FAA says you can't use the medication while flying nor can you have an active diagnosis. So if you have ever been diagnosed with ADHD, even as a child, your only option is to go through an expensive testing process to prove you don't have ADHD anymore. Or some people just lie. Easiest and most dangerous approach is to never be diagnosed in the first place.

The FAA is rewarded for caution, not inclusivity. But they are making changes, like very recently making exceptions to allow diabetics to be pilots: https://www.diabetes.org/resources/know-your-rights/discrimi.... Just know that a diagnosis can never been deleted.