LOS ANGELES — “21 Jump Street” is a hit. “RoboCop” and “Dirty Dancing” are on the way. Arnold Schwarzenegger is juggling a bunch of action flicks.


1987?


No. Weirdly, 2012.


Digital entertainment options and social media might be changing the movies. But Hollywood is sloshing in its Hot Tub Time Machine with a cluster of projects that recall an era when hair was big, heroes had biceps and the stars who are returning to the limelight were a lot younger.


Billy Crystal’s return as the Oscars host, it turns out, was just a warm-up act.


For the first time in a decade, Mr. Crystal, 64, is a leading man. He plays opposite Bette Midler, 66, as Artie Decker, a grandpa who takes charge of his daughter’s three children in “Parental Guidance,” set for release by 20th Century Fox in November.


It’s all part of a retro mood that has revved up the careers of baby-boom performers while providing comfort food for the audience. At a time of plunging DVD sales and an up-and-down box office, Hollywood is doubling back on past hits in search of profits. Often the remakes feature familiar stars playing iconic roles, like Bruce Willis, 57, who is preparing for yet another “Die Hard” film, his fifth.


These favorites and their stars are making a comeback not just because they are — or were — proven winners with an aging audience, but also because they mean something to a new generation of filmmakers.


“The people who decide what movies get made are now, like me, in their early 40s, and they’re turning back to what they grew up with,” said Jonathan M. Goldstein. Mr. Goldstein is co-writing and codirecting an updated version of “Vacation” (1983) and is hoping to land Chevy Chase, now 68, in a reprise of his classic role as the bumbling traveler Clark Griswold.


“There’s nothing new under the sun,” said Thomas Pollack, a film producer who was the chairman of Universal Pictures in 1987. Mr. Pollock said the main change in the film industry’s penchant for the past was its love affair with the “reboot,” a reimagining of an old film, like “Vacation,” that might open the door to a new string of sequels.


Mr. Crystal’s new movie is the kind of heartwarming, wisecracking comedy that used to be written by Lowell Ganz and Babaloo Mandel, the funny guys who turned out “Parenthood” back in the 1989. In fact, the script, based on a story by Mr. Crystal, was rewritten by Mr. Ganz, who is 63, and Mr. Mandel, 62.


“This was, in a sense, a throwback sort of thing,” Mr. Ganz said of the polish he and Mr. Mandel did on a screenplay written by Lisa Addario and Joe Syracuse. The mission, he explained, was to add depth and stronger relationships among characters — qualities that these days might seem old-fashioned but that were hallmarks of their work on Mr. Crystal’s “City Slickers” and “Mr. Saturday Night.”


It was probably inevitable that an array of film and television projects from 1987, on their silver anniversary, should be in development and working their way toward the screen again.


A new version of “Dirty Dancing,” which made hot August nights even hotter when it was released in the summer of 1987, is in active development at Lionsgate, according to Julie Fontaine, a spokeswoman for the studio. And a retooled “RoboCop,” another of that summer’s hits, is in preproduction at Metro-Goldwyn-Mayer, which plans to release it in August 2013.


The cyborg RoboCop is still trying to clean up Detroit, though details are scarce. “We are not able to reveal anything else at this time,” said Jayne S. Zelman, a spokeswoman for MGM.


None of the current throwbacks are likely to match the appeal of fresher, youth-driven movies like “The Hunger Games,” which took in $155 million for Lionsgate last weekend, or the “Twilight” series, whose worldwide ticket sales have exceeded $2.5 billion.


A remake of “Arthur,” a fondly remembered romantic comedy from 1981, found few takers when it was released with Russell Brand in the title role last year. “21 Jump Street,” based on a television show whose pilot dates to 1987, has done better, with over $70 million in ticket sales during its first 10 days.