21. Bought my first handgun at 21.
Growing up no one in the family had or talked about guns, so I had no exposure to them.
For some reason I always had a vague interest in guns and always knew that when older I'd want to have at least a gun to keep for defense...just seemed to make sense to me.
So I taught myself about guns and that was it. Now I've passed it on to my GF, some friends, and trying to get one for my Mom too.