It's a sad day on Sesame Street. The long-running children's show is dealing with backlash after firing three beloved actors that have been with the show since its beginnings half a century ago.

Generations of viewers grew up watching Bob McGrath, who played Bob the music teacher; Roscoe Orman, who played Gordon the science teacher; and Emilio Delgado, who played "Mr. Fix-It" Luis. But they'll no longer be on the show, due to a decision by the show's producers (UPDATE: The show appears to be reconsidering this decision due to a strong response.)

McGrath issued a statement indicating that he was discriminated against because of his age.

The firing comes a few months after the show began a partnership with HBO, after airing exclusively on PBS for the past 45 years.

It also coincides with the show losing its head writer and the show's runtime being cut from an hour to 30 minutes.

HBO says it had nothing to do with the firing and that the show is still completely run by the non-profit Sesame Workshop.

Sesame Workshop issued a statement saying the axing was a step in the show's "evolution."

"Since the show began, we are constantly evolving our content and our curriculum, and hence, our characters, to meet the educational needs of children ... As a result of this, our cast has changed over the years, though you can still expect to see many of them in upcoming productions."

Watch the report above and read more about the latest developments on Fox News Latino.