Elderchild
Male or female who is over 18 and is into children's hobbies / things. Usually a fat pasty person with odd coloured hair for a female or can be a skinny guy with spiky hair for a male, these people are ones who may play with a Nintedndo DS or is a fan of League of Legends.
Thst lady with the pink hair that wears glasses who works at Eb Games is such an Elderchild !