Possible Clues:

• Cheapest accommodation on a passenger ship
• Coach always accepted it's the cheapest way to travel
• How old is the bovine on board?
• Always in coach for the main accommodation
• Cheap seats always available in theatre
• Neat generation that's avoided by the 'posh' set
• At the back you'll find how old the beast is
• How old is one of 22 across back there on board?
• Lowest class
• Cheap seats always available in one part of the theatre