system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Was it impossible for Anakin/Vader to die before fulfilling the prophecy of the Chosen One?

 All those times Anakin could've been in danger as a slave on Tatooine, was in danger from Separatist forces and other threats during the events of the Prequels & associated media like the Clone Wars, along with all the times Vader was under threat in the OT&associated media...was it actually impossible for him to be killed because he was destined to fulfill the prophecy in Return of the Jedi?
gpt
He could have died, but if he had, then the prophecy would not have been made about him in the past because the thing it is prophesising wouldn't have been true, and it was one of those actually-accurate-far-into-the-future prophecies. 

Prophecies are almost always descriptive, not prescriptive. They don't make people immortal because they predicted they would be at a place - they accurate describe the people who happen to survive to make it to said place. 

There are a *few* types of super powerful magical prophecies in fiction that seem to actively force their prediction to occur, and in that case the subjects *would* be effectively unkillable until the fated event, but they are pretty rare, and this wasn't one of them.