According to Wookieepedia, Galen was born 19 BBY (the same year as Luke and Leia) and was killed 2 BBY (two years before the events of A New Hope), making him about 17 years old at the end of the game.
The year the game starts is 3 BBY (Wookieepedia, again), so Galen was likely around 16 years of age in the beginning.
As for the age he was when he was kidnapped by Vader, Wookieepedia has Galen's father dying in the year 18 BBY, making Galen about one when Vader took him. This I find very unlikely since he clearly looked at least 5 in the prologue but make of it as you will.
For additional information, see related link below.
Some websites say his real name is Jacob Nion, but his real name is actually Galen Marek.
Galen Hall is 76 years old (birthdate: August 14, 1940).
Since Galen Marek (Starkiller's real name) was born 19 years before A New Hope and the first Force Unleashed took place 2 years before A New Hope, he was 17 years old.
Yes Galen Is Gay And He Had Sex With Hipocrates.
Marek Seman was born on 1976-02-27.
Galen Marek
In the Force Unleashed II, Galen Marek's clone has two blue lightsabers.
He didn't. In the force unleashed 2 it is a cloned copy of Galen Marek
Galen Marek
galen marek
Galen Marek or Starkiller.
Galen Marek
No. Starkiller's real name is Galen Marek. And they cannot be siblings anyway because Galen is a human and Maris is a Zabrak.
He was raised a sith, but later became a jedi
Darth Vader's on-again-off-again Secret Apprentice from The Force Unleashed series.
he didn't, it was a clone made by Darth Vader
Some websites say his real name is Jacob Nion, but his real name is actually Galen Marek.