This sounds like there was opportunity before that age. Is there a reason you chose to wait until they were so much older?I waited until both kids were 13.
Let both of my boys start shooting .22 rifles and AR's from a rest when they were around 4. Nearly every time I go shoot they are with me. They can both ring a 12" steel plate at 50yd with my AR with Aimpoint red dot or their 10/22 with open sights regularly. They are both really good shots when they take their time and squeeze the trigger.
This year was their first year hunting. BCM 16" Midlength with an old Bushnell 3-9 scope. Both taken with Federal Fusion 62gr. And YES, they both done it all on their own.
6yr old - about 35-40yds, dropped in it's tracks
8yr old - about 65-70yds, made it about 10 feet