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Stewart Gilligan Griffin is ageless, but his specific age is shrouded in secrecy. It's unclear the specific duration of time Stewie entered existing. The baby persona from the animated television show "Family Guy" is immortal. His time on Earth is yet determined.
Stewie, the clever little troublemaker, is hiding his true age from the world. Speculation is rampant as to how many years he
has been alive. Is he over a hundred years old? Or is he fresh to the world? Only Stewie knows! This enigmatic character continues to intrigue fans with his undisclosed age and forever young facade.
List of characters in the Family Guy franchise Wikipedia