I've seen several people say that he was 26, but I know for a fact that he was 23. My reasons follow...
1. I read it on Wookieepedia
2. Vader's my favorite character. I know that he was 22 in Revenge of the Sith, and 45 in Return of the Jedi. Take 22 away from 45... and you get 23, Luke's age in Return of the Jedi
3. If Luke was just three years older in Return of the Jedi, the Emperor probably would have died by then. I mean, look at him in the closeups! He looks like his face could fall off any second!
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About 800 years.He says this in either Return of the Jedi or the Empire strikes back.
Darth Vader, formerly Anakin Skywalker. Anakin Skywalker was born on Tatooine. He had no Father. Anakin was raised by his mother, Shmi Skywalker. When he was 9 years old, Qui-Gon Jin gambled for him from Anakin's master. He was raised as a Jedi, and fell in love with and married Padme Amidala, Former Queen and Senator of Naboo. They had a secret marriage, and she became pregnant with Luke and Leia Skywalker. She died when she had them, and Obi-Wan Kenobi took them to Anakin's Step-brother and Step-sister-in-law, because Anakin turned to the Dark side.
Anakin Skywalker is 22 years old in episode III and is a Jedi knight under the apprentice of obi wan kenobi and diseased Jedi master Qui-Gon Jinn.
Since Return of the Jedi takes place 4 years after A New Hope and A New Hope takes place 19 years after Revenge of the Sith, Luke Skywalker is 23 years old.
That's an odd question. Not in the movies, at any rate. I mean, he does die, but it's like in a book or something. Not in a movie. And to the best of my knowledge, Mark Hamill is still alive. He's the actor who played Luke, if you're wondering.