Fans have often wondered how many years is The Walking Dead, based on its timeline from the start of the zombie apocalypse to the end of the main series. The good news is that The Walking Dead confirmed its timeline since the zombie apocalypse first began and the world fell apart around 13 years prior to the main show's finale. The reveal came in the long-awaited origin story episode for one of its most popular characters, Negan (Jeffrey Dean Morgan), in The Walking Dead season 10 episode, “Here’s Negan.” The show even featured a look at the world before the zombie virus outbreak happened.

The flashbacks gave a clear frame of reference for when the tragic events occurred in Negan's The Walking Dead timeline that changed him. They also helped shed light on how many years passed in The Walking Dead’s timeline. It’s interesting that it took until the...