Elmo, voiced by Kevin Clash, will have a new segment on “Sesame Street” this season. (SCOTT MCDERMOTT)

Elmo, say it isn’t so!

After 13 years, a “Sesame Street” segment that many Kids­Post readers grew up with, “Elmo’s World,” is over.

When the PBS children’s show begins its 43rd season on Monday, the lovable red Muppet will star in a segment called “Elmo the Musical.” (We should point out that since “Sesame Street” has been around for 43 years, some of your parents probably grew up with Big Bird, the Count and Kermit the Frog, if not Elmo.)

“Elmo’s World” was aimed at 2-year-olds, but “Elmo the Musical” will try to bring the beginnings of math, science and technology to preschoolers.

Elmo will continue to sing and dance while showing kids how to solve problems, the creators of “Sesame Street” said.

The children’s show also will bring in its usual series of guest celebrities this season: Charlize Theron, Halle Berry, Melissa McCarthy, Steve Carell, Jon Hamm, Zac Efron, basketball player Blake Griffin, the rock band Train and rapper Common.