We bought our son a ball when he was 3. He rolled it for a few months without holes, just "grannying" down the lane. After he could pick up the ball and easily carry it, I drilled it for him. He is almost 5 now and bowls league in the bantam division, carrying a 65 avg and two handing it....lol
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--"I see your opinion, I just don't give a f$%k."