Stewart Gilligan Griffin is eternally young, but his exact age is shrouded in secrecy. It's unknown the exact number of years Stewie entered on this planet. The infant character from the animated television show "Family Guy" is immortal. His time on Earth is yet to be revealed.
Stewart Gilligan Griffin, the mischievous baby genius, is keeping his age
a secret from the world. Speculation runs rampant as to how many years he has been alive. Is he over a hundred years old? Or is he fresh to the world? The answer is known only to Stewie! This enchanting character continues to mesmerize fans with his hidden age and youthful appearance.
Saison 11 des Griffin Wikipédia