I remember around age 10-16 this was my default state, I could think about things so deeply anytime anywhere, to point I'd be looking at someone not even know.. or just looking at clouds and get lost deep into thoughts and have epiphany half an hour later....
I admit age wasn't the only thing different between then and now, I hadn't discovered reddit, didn't use youtube much, only played video games around 8pm for 2 hours, had very consistent schedule, had far fewer responsibilities, and things always looked up and up in sense there was lot of hope and potential, future seemed brighter. I guess reflecting back I can see my mind was much more free of distractions. (social media, news, entertainment, etc) :/