Creatine is a performance enhancing supplement and should have the same effect on a 14 year old as any adult. Your body stores phosphocreatine in its tissues which is used as part of your anaeorobic energy system. When your body works fast and hard (sprinting, explosive Weightlifting) your body needs to access energy quickly. It converts the stored phosphocreatine without oxygen (that's why its anaerobic) into usable energy (ATP). Creatine supplements increase that reserve of creatine in your body, allowing you to extend the period of hard, fast, explosive work you can accomplish.
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