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Stewart Gilligan Griffin is eternally young, but his specific age remains a mystery. It's
unknown the exact number of years Stewie entered living. The toddler character from the animated television show "Family Guy" is age-defying. His age is yet to be revealed.
Stewie, the clever little troublemaker, is hiding his true age from the world. Speculation runs rampant as to how many years he has been alive. Is he a century old? Or is he fresh to the world? Only Stewie knows! This mysterious
character continues to mesmerize fans with his hidden age and youthful appearance.
L'Incroyable Histoire de Stewie Griffin Wikipédia