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Stewie Griffin is ageless, but his specific age remains a mystery. It's unknown the exact number of years Stewie entered on this planet. The toddler persona from the animated television show "Family Guy" is age-defying. His time on Earth is still determined.
Stewie, 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 ancient beyond measure? Or is he a recent arrival? Only Stewie knows! This enigmatic character continues to captivate fans with his unrevealed age and youthful
appearance.
Stewie Griffin Wikipedia