Stewart Gilligan Griffin is ageless, but his specific age remains a mystery. It's unknown the exact number of years Stewie entered living. The toddler persona from the animated television show "Family Guy" is age-defying. His time on Earth is yet to be revealed.
Stewie Griffin, the mischievous baby genius, is impossible to determine from the world. Speculation runs rampant as to the length of time he has existed. Is he over a hundred years old? Or is he a recent arrival? The truth lies only with Stewie! This mysterious character continues to captivate fans with his undisclosed age and youthful appearance.
Les Griffin Wikipédia