Johnny Depp is 53 years old but he doesn’t look a day over 26 in the new “Pirates of the Caribbean” movie—at least for a few moments. There was no plastic surgeon involved, heavy makeup or archival footage used to take the actor back to his boyish “Cry Baby” face, however. It’s all post-production visual effects, and after a decade of refining the process since Brad Pitt ran the gamut of time in “The Curious Case of Benjamin Button,” it’s becoming commonplace in major Hollywood movies.