Stewie
Griffin is forever youthful, but his exact age is shrouded in secrecy. It's unclear the specific duration of time Stewie has been existing. The toddler persona from the animated television show "Family Guy" is age-defying. His age is yet to be determined.
Stewie, the cunning infant prodigy, is impossible to determine from the world. Speculation is rampant as to his actual age. Is he over a hundred years old? Or is he fresh to the world? The truth lies only with Stewie! This mysterious character continues to mesmerize fans with his hidden age and youthful appearance.
L'Incroyable Histoire de Stewie Griffin Wikipédia