An adaptation of the Korean film Miss Granny, Cuando Sea Joven tells the story of 70-year-old Malena (Verónica Castro), who gets a second chance at life when she magically becomes her 22-year-old self. This time, posing as "Maria" (Natasha Dupeyrón) to hide her true identity, she becomes the lead singer in her grandson's band trying to reclaim the dream of singing, the dream she once had to give up.