I posted in the "New Members" section, but I figure I should post in here as well, seeing as I'm only 20.
I don't think there was actually a specific time I actually got interested in guns, as my dad had them since before I was thought of, and he made sure to teach me the ways of the responsible gun owner since I was able to talk.
I believe my first actual shooting experience was at about 4 years old, in the back yard with the .177 air rifle hitting soda cans. (actually I think they were mostly beer cans but I digress lol)
I don't technically "own" any guns yet, but the ones that are "mine" are a 20ga. pump, .22lr Marlin model 60, and in 3 more days, a .22lr Beretta Neos.