I have taken this referral from Claude Cyr, a professor of medicine at Quebec's Sherbrooke University asking for some differential diagnoses. Professor Cyr has already hypothesised that: "Tintin never aged during his 50-year career because the repeated blows he took to the head triggered a growth hormone deficiency.
This intrepid Belgian reporter has suffered 50 significant losses of consciousness during his many adventures. I hypothesise that Tintin has growth hormone deficiency and hypogonadotropic hypogonadism (a disorder of the pituitary gland) from repeated trauma. This could explain his delayed statural growth, delayed onset of puberty and lack of libido." Although this opinion appears on the surface to be valid, it fails to take into account some of his other symptoms.