The unpaid screwing-around-with-computers I did from ~13 through college is very relevant for my employers. I'd be a way shittier developer if you took out especially the Linux admin and networking stuff I picked up then, most of which I would not have picked up at any of my employers since, nor in college—I'd have just been among the other developers without a clue why X is happening or Y is broken—though it's consistently been extremely useful.

For the record, I did paid screwing-around-with-computers from 15 on, but the unpaid stuff added at least as much value to me as an employee.

Ditto my abandoned humanities degree, which I also don't put on my résumé. More valuable to my work as a software developer than the CS degree I eventually got. I wouldn't present it that way for obvious reasons, but that doesn't change the reality of it.