Darth is a title used by the sith, almost all the sith have a name that starts with "darth".
--Update--
Depending on what era it is in and what that person has accomplished, not EVERY sith becomes a Darth, some are merely Lords.
Yoda would defeat Darth Vador in a battle because he is much faster and more powerful. Darth Vador is slow.
Darth sidious
Yes
James Spader
He's in his early forties when he dies.
Luke Skywalker and Darth Vader are 2 different people.
Darth Vador, a lot of people know him by his famous plot twist, "I am your father"
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Darth Vador was mad that he killed his wife so he destroys it.
Anakin Skywalker
The character name is Darth Vader (Sith name of Anakin Skywalker).
no, stormtroopers were engineered by the emperor after revenge of the sith to be completely loyal to any empirial officer that was outranking him. especially to Darth Vader and the emperor.