I was around 20 before I got my first. It was a center fire carbine.
I was shooting by age 6 though. I did a lot of shooting with my Dad and Uncle. I shot 10 or 20 rounds of 22lr before loading up a Hawken with 40gr of FF and a round ball /forums/images/graemlins/grin.gif
I had access to my Dad's stuff, and used it when I was a teen, and still do(I have all his stuff locked up in my safe). I didn't actually get my own though till I was about 20.
]My Dad, he had a 22lr(still has it 55 years later; my son uses it) Mossberg bolt action when he was about 9, and a 12 guage Winchester 97(Still has it...) pump when he was 10. He used to shoot rats and skunks around the farm with them. He got a couple others while he was a kid too. But, he never did get me or my brother anything. We used his, but we never had our own.
I did get my son a Red Ryder at 7, and he won a Crossman at a raffle benefit for a duck refuge. I got him a old 1905 Stevens "Little Scout" single shot falling block 22lr when he was 8. He only uses them with supervision, mine in particular...
I am looking forward to this fall hunting season; my son will be old enough to hunt.