Explorers on the Moon: Part 2 - S3-E12
Audio problem: When Calculus is telling Tintin via the radio that he, Haddock and the detectives are headed out to a nearby mountain range, he can be seen inside the tank as he is communicating with Tintin, but his mouth is never shown moving. (00:26:00)
Answer: According to Wikipedia, he is described as being a youth anywhere from 14 - 19 years old. There is no specific age.
raywest ★