Stewie Griffin is eternally young, but his exact age is shrouded in secrecy. It's unclear how old Stewie entered on this planet. The toddler character from the animated television show "Family Guy" is age-defying. His number of years is yet determined.
Stewart Gilligan Griffin, the cunning infant prodigy, is hiding his true age from the world. Speculation runs rampant as to his actual age. Is he a century old? Or is he a newcomer? The answer is known only to Stewie! This mysterious character continues to captivate fans with his unrevealed age and youthful appearance.

Lois Griffin Matriarch of The Griffins