The actress who plays Mandy, Raegan Revord, was born on December 9, 2002. Based on her birthdate, we can calculate her age.

Leo bursts into the kitchen during a commercial break. “Mom, quick! How old is Mandy from Young Sheldon ? Me and my friend Alex are arguing. He says she’s in her late twenties. I say early thirties.”

Mandy is a sweet and intelligent character who is often seen accompanying Sheldon and their friends on various adventures. Throughout the series, she provides support and friendship to Sheldon, helping him navigate the challenges of growing up. Raegan Revord's portrayal of Mandy has been well-received by audiences, and her character has become a fan favorite on the show.

Here’s a short, useful story that answers the question while illustrating why TV character ages can be confusing.