Stewie is timeless, but his specific age is shrouded in secrecy. It's unknown the specific duration of time Stewie became living. The toddler persona from the animated television show "Family Guy" is age-defying. His age is yet to be revealed.
Stewie, the mischievous baby genius, is impossible to determine from the world. Speculation abounds as to his actual age. Is he over a hundred years old? Or is he fresh to the world? The truth lies only with Stewie! This mysterious character continues to intrigue fans with his hidden age and youthful appearance.

Family Guy 25 Things About Stewie That Make No Sense TheGamer