The Jetsons S02 E29 The Wrong Stuff

"Everyone's favorite family of the future!"

After winning a school science contest, Elroy is invited with the family to view a space shuttle launch. But he gets more than he bargains for when he and Astro get aboard the shuttle and get launched into deep space. They're able to return to Earth, but are significantly changed in terms of age. A parody of The Right Stuff.