I took my son squirrel hunting with me right before he turned 5. Of course we spooked everything within a half mile. He went turkey hunting a couple times last spring at the age of 6, but we didn't get a shot. Deer hunted a few days this fall, but no luck either. He is now 7 and ready to go this spring. He has a 20 gauge he can handle real well. Look forward to this spring.
My youngest is 4, which is about the age my dad would let me tag along with a fake gun or BB gun. He sat in the blind with me a couple of times this fall, about an hour at a time and then he was done. I love it and can't wait for them to go all the time.