He was thirteen
Yes in the German version he is one of the voices once again.
Bill Kaulitz along with his identical twin brother, Tom Kaulitz, starred in a movie called 'Verrückt nach dir' in 1994 when the twins were 4 or 5 years old. Their roles were uncredited. In 2006 Bill Kaulitz did the voice role of Arthur in the first part of 'Arthur und die Minimoys' (the German version of 'Arthur and The Invisibles') In 2009 Bill Kaulitz voiced Arthur again for the 'Arthur und die Minimoys' (German version of Arthur and The Invisibles 2) sequel I hope this answers your question.
German.
Actually, he has been in a movie before. He was Arthur in the German version of "Arthur and The MiniMoys" when he was around 10-11
Bill Kaulitz sang "It's Raining Men" on the German version of Star Search when he was 13. Supposedly he lost a bet with Tom and had to a) audition for SS and b) sing that song.
He's German.
Yes, he played Arthur in the German version of the movie Arthur in des minymois 1 (i think that's how you spell it)
Yes they all are.
He's German.
When Tokio Hotel's single 'Durch Den Monsun' came out, Bill and Tom Kaulitz were 15 years old.
Kaulitz like bill and Tom kaulitz from Tokio Hotel.
Pretty sure they are 100% German