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Stewart Gilligan Griffin is eternally young, but his precise age remains a mystery. It's unknown the exact number of years Stewie became existing. The infant persona from the animated television show "Family Guy" is forever young. His age is still determined.
Stewie Griffin, the cunning infant prodigy, is impossible to determine from the world. Speculation abounds as to his actual age. Is he ancient beyond measure? Or is he a recent
arrival? The answer is known only to Stewie! This mysterious character continues to mesmerize fans with his unrevealed age and youthful appearance.
L'Incroyable Histoire de Stewie Griffin Wikipédia