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My son turned 13 this last March. Yesterday he uncorked a 278 yard drive. I just got him last week a 7.5 degree G15 Ping driver with an Oban Devotion shaft cut to 45.5 inches for his birthday. This thing hits line drives that just roll forever. This time, I saw his ball take the first bounce at about 230 and 2 more big bounces with roll later he was out to 278. He traditionally has too high a ball flight and so we've gradually come down from 10.5 to 9.5 to 9 to 8.5 and now finally this Ping at 7.5. He finally has roll in his drives, with anything 9 and above he would just get about 1 yd roll at most.
