I am in my sixties trying to cope with the fallout of not dealing with it earlier in life. In fact, I am becoming aware of a lot of things late in life. It sucks, but it also humbles me and makes me turn to the source of strength on whom we all must eventually rely.
I write software for a living and I notice that my biggest problems are getting started in the morning and jumping to CB every few minutes to see what is new (I am writing this post when I meant to be working). Failing to recognize this as a real problem was one of my biggest problems. Having recognized it, I have a choice - force myself to engage in the mornings or waste several hours with inefficient work. I have to make this choice daily, hourly and by the minute.
All those other results of not dealing with it - short job tenure, divorce, etc. - happened to me without me recognizing contributing causes.
I have tried medication, but it doesn't make me develop good habits, so I am choosing (for now) to will myself to do better.