BB gun at 8. I was only allowed to shoot it into a BB trap in the back yard. Thereafter I was accused of breaking everything that ever got broke in my neighborhood. I was innocent.

My daughters each started shooting when they were about 9 years old ... under supervision.

My son shot his first squirrels with a chipmunk 22 at 7. He shot at silhouettes from about 5 off a rest and won a BB gun shoot at Freeland around 6 or 7. But my wife and I shot a lot so he was immersed in it for ever. He started formal small bore and air rifle at 10. That said, I have coached Juniors for 33 years and we start kids at 11. We did do them younger for a long time but kids attention spans are all over the place and we felt 11 MOST showed they were more apt to be focused and not play around. JMO

I don’t believe there is one age that is the perfect time to begin.  I think a lot depends on the individual child.  I started both my children around six or seven.  My daughter enjoyed it, but never took up the sport.  My son liked it, too, but it wasn't until he was almost 25 that he really took off and got back in earnest. My one grand daughter took shooting at about thirteen; loves rifle and trap shooting.  My other grand daughter is just six.  I just finished a .22 single shot for her.  I think she will be ready this fall.  I’ll let her Dad get her started.
Shooting something they can handle, weight wise, and not too much noise or recoil seems to be a winning ticket.

In my experience, if you teach young girls to shoot, they'll soon be out-shooting you, which is great!

Ranch13 they should publish the names of the offended ones so there neighbors can console them
No doubt transplants

bnice, what some of these illegal immigrants and those on H!V visa's that over stayed their visa's, don't seem to understand that shooting is in Wyoming's blood. We shoot a lot here, start kids on proper gun handling and marksmanship at a young age.
The 4-H shooting sports draw more kids here than any of the other segments of 4-H.
As to when to start a kid shooting, that's mostly dependent on the kid. When they can physically handle the rifle and have developed enough critical thinking skills enough to understand what's about to happen then it's time to take the time to teach them.
The thing I hate to see is someone hand a kid a 10-22 with a 3 round magazine and let them start blazing away...Start them on a single shot 22, iron sights and teach them proper rifle craft. Airguns are not a bad place to start, provided it's a good one and not the 29$ one off the big box store shelf.