It's just a larger scale of leaving high-school (or leaving any significant period in your life behind). Things, people, problems from back then don't bother yo

It's just a larger scale of leaving high-school (or leaving any significant period in your life behind). Things, people, problems from back then don't bother you anymore and you remember them only a little bit better than a novel you read, being out of context. Also you dive in nonexistence everyday when in deep sleep. And the universe winding down, well, like you said, its just an idea :-)