My son is 10 and he took his first deer with a bow the first day of season this year. He has been shooting for 3 years now. I won't let him shoot over 18 yards. I don't expect him to shoot for hours on end but we go down and take 12-15 shots almost every night. I feel like if he shoots for a long period of time he gets fatigued and loses his form which hurts his accuracy. As bow hunters we must remember that you get one shot generally so when we walk up to the target I remind him his first shot is the one that counts.