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William Shatner: Focus keeps me going at 80

William Shatner is living it up at 80 years old. The "Star Trek" legend now adds author to his impressive resume with a new book called "Shatner Rules."

On "The Early Show on Saturday Morning" Shatner joined co-anchor Betty Nguyen for "Early Coffee" to discuss how he does so much, from his one-man show to musical recordings to, most recently, a celebrity roast of Charlie Sheen.

The man, still best known for his role as Capt. Kirk on "Star Trek," said he does it all with focus.

Pictures: William Shatner
Spock attends his last "Star Trek" convention

He said, "It's there, you do it, you focus on it, concentrate on it, and it becomes a reality."

In his new book, Shatner talks about his rules for living and how he lives in what he calls the "Shatnerverse," the bubble of his life.

"The big rule is when you turn 80, get out of bed. When I turned 40, I apparently went to bed for three days because I thought, 'What am I going to do with the rest of my life?' I thought, 'What have I done, and what am I going to do at the age of 40? It's all over!'

"And suddenly, you wake up at the age of 80 and your life is over, one would think, and death is staring you in the face and that's really frightening. But you've got to get out of bed, you've got to put one foot in front of the other - and suddenly, life renews."

Shatner also has a new album coming out Tuesday called "Seeking Major Tom."

For more with Shatner, click on the video player above.