I think this can be true while also further enforcing the point. I was a child in the 80's and would ride my bike all over town just doing stuff. Sometimes alone, sometimes with friends. Yes, I know that sounds like older guy nostalgia.
But the idea that a full work day is the only reason that adults aren't "bored" seems absurd to me. The world is full of low-cost wonder. We have allowed ourselves to be captured by low agency tasks like watching TV and scrolling through phones.