I Love Guns [Pro Gun]

Teach them respect for weapons and safety first. Then go from there

Even with close supervision anyone under the age of 10 IMO is too young, from 10 and up with close supervision a child's parents can easily determine what their child can and can not handle, no child should ever be left alone with a firearm or left alone with a firearm in easy reach.

Obviously firearm safety come first and foremost. Cleaning and maintaining the weapon in my opinion is a serious issue for all gun owners but not for a child. I took my first shot(s) at the age of 8 but Ronin8510 is right it starts with teaching respect for the firearm.