LONDON - Hollywood actor Sam Worthington has signed on to star in two sequels of upcoming sci-fi epic “Avatar”.

The Australian actor has however expressed his fears that he’ll be an old man by the time the trilogy wraps up, as the first part took director James Cameroon 14 years, reports contactmusic.com.

Worthington was recruited in 2007 to play a paraplegic ex-soldier in the project and he also admits the shoot was long and exhausting.

“You work 18-hour days. I was on it for 14 months. Jim’s (Cameron) still editing. We’ll still be filming it up to the day it’s released - probably after the movie comes out, knowing Jim! That commitment is what makes him the man he is. It’s life or death. It’s war. That’s how he approaches movies,” he said.

“We’re signed for a trilogy. But I think I’ll be 94 by the time it finishes, to be honest. I know Jim’s got some ideas in his big head,” he added.