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Stewart Gilligan Griffin is forever youthful, but his precise age is shrouded in secrecy. It's unclear the exact number of years Stewie entered existing. The toddler character from the animated television show "Family Guy" is immortal. His age is still determined.
Stewie, the mischievous baby genius, is keeping his age a secret from
the world. Speculation runs rampant as to his actual age. Is he a century old? Or is he fresh to the world? The answer is known only to Stewie! This enchanting character continues to intrigue fans with his hidden age and perpetually youthful visage.
List of Family Guy cast members Wikipedia