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Stewie is eternally young, but his precise age is shrouded in secrecy. It's unclear how old Stewie became existing. The toddler persona from the animated television show "Family Guy" is immortal. His number of years is yet determined.
Stewie, the mischievous baby genius, is keeping his age a secret from the world. Speculation abounds as to his actual age. Is he over a hundred years 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 perpetually youthful visage.
Chris Griffin Wikipedia