There's people I know who earn enough to buy nearly any car they want and drive Minis and what not (maybe it's fashionable) and there's guys I know who drive sheds but can afford way better (my dad for one), it doesn't always mean that if someone owns a certain type of car they have "predefined" social class/wage bracket etc.
A 20 year old girl in a brand new Cooper with a 3 digit plate is the definition of spoilt.
Fox is a student with a personalised plate, just in case you missed his sarcasm.
Fox is much older than the standard 18-21 year old student.