Sesame Street’s Elmo turned 3-and-a-half Feb. 3, despite being introduced on the show in 1980. Here’s the reason why his age stays so specifically fixed.

Elmo is turning 3-and-a-half, his age forever and always, since he joined "Sesame Street" in 1980. Of late, he's become a social media sage.

Appearing on “Sesame Street”? That’s the best idea. The 55th season of the acclaimed family program features a star-studded lineup of ...