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I don't think he's completely done growing quite yet. Though there will be more time between sheds as the sheds depend on growth. I guess the answer is, no he's probably not reach full adult size but yes it's normal that the shedding has slowed
15 seems small, he should reach a bigger size. I don't see most healthy and well raised dragons being under 18 inches as adults. Shedding may slow down but he may still be far from done