I don’t know if it has been explored in great depths in general media, but I know just about every single cartoon I’ve ever seen has done at least one episode involving age regression. I also know that season 3 episode 9 (Secret Agent Bear) of Yogi’s Treasure Hunt they had Dick Dastardly was trying to hold world leaders ransom with fountain of youth water and that’s the closest I can think of to this super power that I’ve seen in popular media.