When I was young? (to be on-topic). Hmmm... Chasing dinosaurs, rampaging with fellow Vikings and so on.
Or when I was in my young teens, designing and building electronic devices, such as disco lighting systems (a very new-fangled idea then), sound systems and so on.
It may say like nothing much, but in those days, it was ground-breaking new design work. Back then, there were no computers, no internet, not even calculators or digital watches. We listened to the wireless on long, medium and short wave and there were two TV stations (BBC and ITV), which started at about 5 in the evening and finished at 11 with a quick burst of "God save the Queen", for which my parents stood up.
Like Fred (see below) I also played various musical instruments (still do). Bass guitar, drums, keyboards, piano accordian, harmonica, descant recorder and so on.