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Stewie Griffin is eternally young, but his specific age is shrouded in secrecy. It's unknown how old Stewie became on this planet. The baby persona from the animated television show "Family Guy" is immortal. His age is still determined.
Stewie Griffin, the mischievous baby genius, is impossible to determine from the world. Speculation abounds as to the length of time he has existed. Is he ancient beyond measure? Or is he fresh to the world? The answer is known only to Stewie! This enigmatic character continues to intrigue fans with his hidden age and perpetually youthful visage.
List of characters in the Family Guy franchise Wikipedia