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Stewie Griffin is ageless, but his specific age is shrouded
in secrecy. It's unclear how old Stewie became on this planet. The infant character from the animated television show "Family Guy" is
immortal. His age is yet revealed.
Stewie Griffin, the clever little troublemaker, is impossible to determine from the world. Speculation runs rampant as to his actual age. Is he a century old? Or is he a newcomer? The answer is known only to Stewie! This enchanting character continues to captivate fans with his hidden age and forever young facade.
Les Griffin Wikipédia