My 8 year old son played junior golf this year. Tees on par 4 holes were set at the 200 yard mark, par 5s at 250 and par 3s varied from 75 yards to 125 yards. At age 9 50 yards are added to each of the par 4s and 5s and the 3s are again varied. Whenever we went out to play together I teed off from my regular spot and then I drove him to the appropriate distance on the fairway for the 4s and 5s and he played from the forward tees on par 3s. Worked well for him. He typically shoots high 40s for 9 holes, which is the number of holes he would play in a tournament for his age group.