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About 47 officially.

He was 9 in Episode I, 19 in Episode II, 23 in Episode III when Luke was born; Luke was about 20 in Episode IV (here sources differ, originally it was 16 in the script) and it is generally held that Episode VI where Vader dies happens 4 years after Episode IV. I believe Luke was 17 in Episode IV, and Episode VI was approx. 4 years after Episode IV, and Vader was 23 in Episode III... that would put him at about 44 years old.

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