In his new book, The Physics of Star Wars, Dr. Patrick Johnson explores when the universe of Star Wars actually took place. In an excerpt he provided Wired, he writes, “The best theories that we have indicate that our universe is about 13.7 billion years old. Assuming the Star Wars galaxy is in our universe, we need a few indicators to determine when in our universe’s history Star Wars could occur.”
He goes on to elaborate more into when the first galaxies began to form and how long it took for single celled organisms to evolve into mutli-celled organisms (fun fact: about two billion years.)
If you’re looking for a straight answer to the question of just when Star Wars actually takes place in our timeline, Johnson writes that the events of Star Wars would have taken place at least nine billion years after the Big Bang, although he’s also willing to admit that Star Wars happened in a parallel universe, or even in a time before the Big Bang.
I guess that rules out Darth Vader having lightsaber duels with any dinosaurs then.