Destination Moon: Part 2 - S3-E10
Revealing mistake: When Calculus is showing Tintin and Haddock around the rocket, they are in the deck below. Tintin and Calculus have already climbed down the ladder and Haddock is still climbing. Whilst Haddock is climbing down, the button on the back of his space suit vanishes for one frame. (00:31:50)
Answer: According to Wikipedia, he is described as being a youth anywhere from 14 - 19 years old. There is no specific age.
raywest ★