(but Greg thinks he could be 32)
Baby Gibson is a character who appears in Diary of a Wimpy Kid: The Meltdown. He lives in the same neighborhood as Greg and Rowley, and it's also said that he lives with his grandmother (it's never explained who his parents are or what happened to them). According to Greg, no one knows for sure just how old Gibson is, because no matter how much time passes, he never seems to get any older. In fact, as Greg notes, as far as anyone (including Greg himself) knows, "Baby" Gibson could easily be an adult with kids of his own.
- Diary of a Wimpy Kid: The Meltdown (First appearance)
- Diary of a Wimpy Kid: Wrecking Ball (Last appearance)