The Red Sea Sharks: Part 1 - S3-E1
Plot hole: When Tintin is listening in on Dawson's conversation, he realises an alarm clock had been planted in his coat pocket as a prank by Abdullah. Even if he didn't see the clock in his pocket beforehand, there is no reason why he wouldn't have felt the added weight the clock would have had on the coat. (00:09:35)
Answer: According to Wikipedia, he is described as being a youth anywhere from 14 - 19 years old. There is no specific age.
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