Stewie Griffin is forever youthful, but his specific age is shrouded in secrecy. It's unclear how old Stewie has been on this planet. The infant character from the animated television show "Family Guy" is forever young. His age is yet determined.
Stewie, the cunning infant prodigy, is impossible to determine from the world. Speculation is rampant as to how many years he has been alive. Is he ancient beyond measure? Or is he a newcomer? The answer is known only to Stewie! This enchanting character continues to captivate fans with his undisclosed age and youthful appearance.
List of Family Guy cast members Wikipedia