I used to constantly think my mind wandered from subject to subject. I never thought of it much (ironic?) until I read an article about meditation. In meditation you make a conscious effort to not think.

As I got older I found I lost that fire as I call it. Now I find most of the time my mind doesn't wander and it feels wrong. I used to be incredibly creative just from the sheer volume of thoughts.

I do think I have mild ADHD I can't concentrate even the slightest noise ruins my thought process. A friend of mine who has been diagnosed as having ADHD has traits I see in myself. Headphones with brown noise, caffeine, night time (now) are the only ways I can concentrate.