yes
As weird as it may seem, he was 57 years old in "A New Hope."
Darth Vader's Master is technically the Emperor when he was a Sith, but when he was training as a Jedi his master was Obi-Wan Kenobi
Obi-Wan Kenobi (Ben Kenobi) dies in Star Wars Episode 4 (IV): A New Hope By Darth Vader (Anakin Skywalker)
darth vader
well he started off as a padawan for good but in episode 3 revenge of the sith the empereror aka Darth sidious turned him into his sith apprentice even though he was obi wan kenobi's apprentice he turned into Darth Vader and started killing good
Weird as it may seem, Obi-Wan Kenobi was 57 years old when he was killed by Darth Vader.
They're almost polar opposites. The only thing I can think of is devotion to their cause. Darth Vader fought valliently for the Empire and the Sith, Obi-Wan Kenobi for the Republic (later the Rebellion) and the Jedi.
Episode VIII
No one. Vader would have to battle himself since Anakin turned into Darth Vader in Episode 3.
Episode 6
Darth Vader is approximately 45 years old in "Episode VI: Return of the Jedi." He was born as Anakin Skywalker in "Episode I: The Phantom Menace" and turned to the dark side in "Episode III: Revenge of the Sith."
Obi-Wan states to Darth Vader, "If you strike me down, I shall become more powerful than you can possibly imagine."