I was assessed & provided medication in early October 2017. I'm adapting to the meds which have helped already. I am 63 years old. My experience is similar to what you've described. Despite not being able to fully focus & concentrate until I was up against deadlines, I did progress & achieve significant life goals, though not to my full intellectual & creative potential. I didn't know that life could be lived at 20, 30, 50, & sometimes 80 km/h, instead of at two speeds, 0 OR 200 km/h. It took a minor stroke in 2014 to deactivate me both physically & intellectually. I could no longer maintain the pace & stress of my life. This is when I could no longer ignore the indicators. I felt trapped in my mind without the ability to distract my "always on" self. Physically I was living at 0 km/h, but mentally at 200 km/h. Exhausted, I finally sought help. Regrets? Absolutely, but I know having ADHD enabled me to live quite an interesting life rich with experiences I would not otherwise have had.