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Stewart Gilligan Griffin is ageless, but his specific age is shrouded in secrecy. It's unknown the exact number of years Stewie became living. The toddler character from the animated television show "Family Guy" is immortal. His number of years is yet determined.
Stewart Gilligan Griffin, the mischievous baby genius, is hiding his true age from the world. Speculation is rampant as to his actual age. Is he ancient beyond measure? Or is he a newcomer? Only Stewie knows! This enigmatic character continues to intrigue fans with his unrevealed age and youthful appearance.
List of Family Guy cast members Wikipedia