All kids are-different. My youngest was WAY too young at 4. My daughter probably would h av been OK with it but I still waited a little. I did let her shoot a BB gun at 5. I was afraid the noise would scare her away form shooting. I had hewr shooting 22 around 6-7 years. By the time she was 11 she would shoot about anything. She had no trouble hotting a qt oil bottle at 150 yds. She was bit of a long gun prodigy though. It all come pretty natural for her. She never did flinch.
My youngest has been at since he was about 6-7 with a BB gun. Dang boy just had no attention span. He's 13 not and shoots smaller guns bu seems to shy away from bigger ones. He's uber sensitive to sound though. Has hearing like a dog wearing cranked up belltones. I don't have access to him all the time though and his mother (my X) is a borderline liberal gun hater.
So it's been a little slow moving with him.
At he end of the day only the parent can really know if a kid is ready for shooting. I found it was good to start them slow. Get them around the guns and get used to noises and talking about safety. It's very important to get something that fits them. My daughters firs experience was with a 22 bolt gun that was made for kids (crickett
) and went from here. With a long gun that fits them you can get them used to proper handling it seemed to me anyway.
I wish you luck in your child rearing project. I think teaching our youth about guns is a great thing for them in many ways. Quality time that gives them tools that they can have use for the rest of their lives. So many kids just sit and play vid games and all the education they get is the spoon fed BS the school system is giving them. Anything that is more real world is all the better way I see it.