My oldest daughter shot her first deer at 10 my youngest daughter at 8. Oldest used a 243 youngest a lever action 44 mag by her choice. If i had to do it all over again I now I would have had them use a 6.5 Grendel in an AR. I built one for me and I love deer hunting with it and it just lays them deer down. I built it with a CF barrel and a little 4-12 leupold scope and it shoots little tiny bug hole groups and recoil isnt even enough to move off target your shooting. I dont know what or if you have a minimum caliber for deer where you hunt but I would recommend checking out the Grendel round. I know when my grand kids get old enough to hunt that is what I will recommend for them. Most importantly treasure the times and experience with your kids they grow up way to fast now days and GOOD LUCK...