SAN DIEGO – Harrison Ford says the young celebrities in the new “Star Wars” film must prepare themselves for both light and dark sides of popularity.

“It’s too late for them. After all, it’s over. Life as they knew it is really no longer possible,” he said.

“You Have checked in for the biggest. ride t ever was.”

The 72-year old actor appeared alongside fellow “Star Wars” veterans Mark Hamill and Carrie Fisher at Comic Con Friday for a demonstration on the hoped-for seventh episode 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 likely be by turns joyful and pleased and used, and then you’ll wonder what the hell happened, every once in a while,” he said.

“The Force Awakens” is set to hit theaters in December.

Harrison Ford