In *Ready Player One*, James Halliday has riddled the Oasis in general and the quest specifically with references to things he enjoyed in his youth in the '80s. Music, such as *2112*. Films, such as *War Games*. Games, such as *Joust*. 

**What is the oldest piece of real life, 20th century pop culture referenced by James Halliday? And what is the most recent one (20th or possibly 21st century)?**

This can be a part of a challenge, or something else created by James Halliday and inserted in the Oasis, that reflects a person, group, organisation, work, object, or anything else that exists or has existed in real life.  

This assumes more or less that the timeline as presented in *Ready Player One* is equal to the real world timeline up until present day (technically until the date of publication).

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*I'm interested primarily in the book. Answers based on the film should mention that they are.*