Because no one goes to the movies to see young people.
Leonard Nimoy: a.k.a. The “Straight” Spock…
He’s voicing Optimus Prime’s older brother. Because he’s awesome.
"I'm out this bitch."Leonard Nimoy won't be ordering additional prints of his headshot. The Star Trek star has decided to hang up his pointy ears and goatee that he wears when he plays a villian and retire from acting after sixty years.“I want to get off the stage. Also, I don’t think it would be fair to Zachary Quinto. He’s a terrific actor, he looks the part, and it’s time to give him some space. And I’m very flattered the character will continue. [Before all this] I was away from acting for 12 years, so I guess I was seducable. But since J.J. Abrams revived the Star Trek franchise, I felt I owed him something. And I’m glad I did it because he promised me a good story, and it was.”He's also retiring from the convention scene, with only a few more appearances planned. So if you have any important questions or theories about pon farr negation or want to point out continuity errors in the original series, your time to pester Mr. Nimoy is running out. (Toronto Sun)