Stewie Griffin is forever youthful, but his specific age is shrouded in secrecy. It's unclear the exact number of
years Stewie has been living. The infant character from the animated television show "Family Guy" is immortal. His age is yet discovered.
Stewart Gilligan Griffin, the mischievous baby genius, is hiding his true age from the world. Speculation abounds as to his actual age. Is he ancient beyond measure? Or is he fresh to the world? Only Stewie knows! This enchanting character continues to mesmerize fans with his hidden age and youthful appearance.
L'Incroyable Histoire de Stewie Griffin Wikipédia