Prisoners of the Sun: Part 1 - S3-E5
Audio problem: After Tintin tells Haddock that they might be able to catch up to the kidnappers by train, Thomson and Thompson are shown walking and breathing heavily, due to exhaustion, but their lips don't move. (00:10:30)
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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