I was diagnosed almost a year ago at age 30.
I think 'How would this help me?' is a great question to explore. I'm quite different to you as I struggle to maintain a full time job or a consistent relationship. Adults with ADHD have often developed coping methods and systems that work well for them.
Even if you are diagnosed you don't have to take any particular course of action. Medication is not mandatory.
After I was diagnosed I tried concerta. I didn't really feel it helped me a lot. I am currently in part time work but struggling to progress in my career. 8 years in and I'm still a junior and I think my condition is a big contributor.