I do not know anything about ghosts in foreign countries. Ghosts called Yurei or Obake in Japan do not age and remain the ages of thier own ones. The ghost of thirty-seven years old after he died more than ten yares ago and who took seat at the Lufthanza 747 is very strange for me. If he is the ghost, did the stewardess really see him and tell him, "Are you alright?"? I also doubt ghost got sick after listening to the song of Beatles. I wonder why Jay thought your view makes sense.