SAN DIEGO » Harrison Ford says the young actors in the new "Star Wars" movie need to prepare themselves for both the light and dark sides of fame.

"It’s too late for them. I mean, it’s over. Life as they knew it is no longer possible," he said. "You’ve checked in for the biggest . ride there ever was."

The 72-year-old actor appeared alongside fellow "Star Wars" veterans Mark Hamill and Carrie Fisher at Comic-Con Friday for a presentation on the anticipated seventh installment in the space saga, "Star Wars: The Force Awakens." Director JJ Abrams and new members of the "Star Wars" family, including Adam Driver, Gwendoline Christie, Domhnall Gleeson and Daisy Ridley, were also on hand.

Ford said he told Ridley, "Your life will change and you will get used to it."

"You will be by turns happy and delighted and employed, and then you’ll wonder what the hell happened, every once in a while," he said. "… The natural state of an actor is to observe life around them. And now you have to figure out how to do that when all anybody is looking at is you."

"The Force Awakens" is set to hit theaters in December.