Parents were anti-gun, but when I was ten they bought me a BB gun, probably because all my friends had them. I owned a swiss army knife from 8 years old, but didn't carry a knife until I was ten or so. I usually carried a cheap folder of some sort, and if it was cold enough for a coat, I'd carry a sheath knife in my inside coat pocket. Probably illegal, but living in a rural-ish area, I didn't much care.
Never carried a knife at school, as by the time I was going through Jr. High and High school, that was a call-the-cops, expulsion-worthy offense.
Because I couldn't carry a knife at school, I generally stopped wearing one from the time I got my driver's license, until I was 20 or so. Now I carry a folder any time I leave my apartment.
As for guns, I didn't own anything more powerful than a BB gun until I was 19, and moved out on my own. It's all been downhill from there.
Honestly, I could wish I'd had more exposure to guns growing up. My firearm experiences as a minor are limited to a single summer at boy scout camp when I was 12, shooting bolt-action .22s. Didn't touch a gun again for seven years, which left me with a lot of catching up to do.