One consideration that should be given to little ones is that safety equipment needs to fit properly. If not, children may seek to shoot (or be near the firing line) without safety equipment.
Eye and ear protection for adults may not fit a pre-teen, but will fit a teen. (and I have a heck of a time trying to find the correct size for kids)
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)