Stewie Griffin is timeless, but his specific age is shrouded in secrecy. It's unknown the exact number of years Stewie has been existing. The infant persona from the animated television show "Family Guy" is immortal. His number of years is still discovered.
Stewie Griffin, the mischievous baby genius, is keeping his age a secret from the world. Speculation runs rampant as to his actual age. Is he over a hundred years old? 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 forever young facade.
Saison 11 des Griffin Wikipédia