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Well, technically, Luke Skywalker didn't kill the Emperor: Darth Vader (now brought back to his original self: Anakin Skywalker) did. But Luke was 23 years old at the time
he dies of old age
One is a fictional character and the other is a real person. Both are well known names but it is very hard to determine who is the most famous.
Mark Hamill, the actor, turns 59 in 2010, Luke Skywalker, however was born a long time ago in a galaxy far, far, away, so we do not know.
If you mean Empire Strikes back then he is aged 22
Luke Skywalker leads a new Jedi Order, gets married to Mara Jade, and has a son named Ben, after his old mentor Ben Kenobi. All of this information can be read in lots of various books.
Luke Skywalker had only one son, Ben Skywalker (named in honor of Obi-Wan "Ben" Kenobi). As to the events, there's tons of media including novels, graphic novels, comics, etc. that tell the events after Return of the Jedi.
If you meant to say how old the actor is in 2009, Mark Hamill was born on September 25, 1951. So on that day in 2009, he turned 58
Luke Skywalker's original lightsaber, from Obi Wan Kenobi, was blue. However, in a fight with Darth Vader, he cuts off Luke's hand with the blue lightsaber. After this, when he got a new hand, Luke decided to get a new lightsaber. The new one was green. P.S. Skywalker is not hyphenated.
Darth Caedus is Jacen Solo. Jacen was a jedi knight who was seduced to the dark side by an old girlfriend of Luke Skywalker, Her name was Lumiya.
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.
Luke Skywalker is one of the most intelligent people in that galaxy so old and far away! He is almost fluent in the skills of a Jedi as his father (Darth Vader) but not quite as skilled in the powers of the force! The force be with you!