Based on the Korean film Miss Granny, Cuando Sea Joven is the story of 70-year-old Malena (Verónica Castro) who is given a second chance at life when she is magically turned back into her 22-year-old self. Now, posing as “Maria” (Natasha Dupeyrón) to hide her true identity, she becomes the lead singer of her grandson’s band and attempts to recapture the dreams of singing she once had to give up.