I'm in my 50's. I have ADHD. I started in IT (despite having a business degree). In two years I rose to Admin in a mid size org. After I got promoted I started to get bored, got sloppy. and fired. Went to a business IT job, rinse and repeat. Started a business, once it was chugging along, I got sloppy with managing it. tanked it. Got an IT job. 4 years later same thing. Started another business. Same pattern. Another IT job... Fast forward, and I'm now self-employed doing IT on site support for small businesses. It strikes a nice middle ground.
Best period was when I started a sign making business. 12 years. Every job a challenge. Fun, but I ended tanking it because of sucking at management.