kids
The OP states 7-8 yrs old. That is a kid to me. My 7-8 yr old kid could manage a .22 Cricket (with .22 CB longs!) at that age, but not any other type of full size firearm. He missed a lot of squirrels!!!!! A Win-37 in .410 was a load for him, and .410 recoil was more than he cared for too. I didn't write it down, but at 8-9 we were likely experimenting with the Marlin as described, and I bought the Mini-Mauser .223 at about the same time. He shot the .223 off the bench, very well at about age 10. He killed his first deer age 11, off shooting sticks, at about 75 yds.
All of this was very highly supervised. Now the kid outshoots me.