Mark Zuckerberg and Bill Gates squeezed into a mini-version of the Meta CEO's Harvard dorm for his 40th birthday bash

Microsoft cofounder Bill Gates celebrated Meta CEO Mark Zuckerberg's 40th birthday in a model of a Harvard dorm.

• Mark Zuckerberg's 40th birthday bash featured recreations of his old bedrooms.
• Bill Gates, in a black hoodie, hung out in a replica of Zuckerberg's Harvard dorm room.
• Gates and Zuckerberg both dropped out of Harvard to pursue their own ventures.

Mark Zuckerberg's 40th birthday bash gave us a glimpse of an alternate universe where Zuck and Bill Gates are college roommates.

Zuckerberg showcased the party in a Tuesday Instagram post. The slideshow shows him in mini-replicas of some of his former cribs — including the Harvard dorm room where he launched Facebook.

Gates, in a black hoodie, blue-gray gym shorts, and tennis shoes, was crouched on a little red sofa next to him.

"Grateful for my first 40 years! Priscilla threw me a little party and recreated a bunch of places I lived in the early days," Zuckerberg wrote in his Instagram caption.

Zuckerberg's wife, Priscilla Chan, also recreated her husband's childhood bedroom, his first apartment, and a pizzeria where Zuckerberg said he "basically lived in college."

The Meta CEO attended Harvard University between 2002 and 2004. He dropped out before he finished his schooling soon after he founded Facebook.

Gates's story is similar: He attended Harvard between 1973 and 1975 but dropped out to start Microsoft.

At the party, Zuck was dripped out in a chain necklace.

Zuckerberg has recently changed his style, opting for more plain tees and gold chains. The look has drawn comparisons to "mob chic" trends and rapper swag.

He also sported a black shirt that read "Carthago delenda est" in old English lettering. The Latin message translates to "Carthage must be destroyed" and was famously uttered by Cato the Elder.

It's unclear if Zuckerberg wanted anything to be destroyed at his birthday party, but he reportedly uttered this phrase on the day Google Plus was launched in 2016.

Zuckerberg's birthday post ended with a video message from his closest family and friends set to "In Da Club" by 50 Cent. Some friends sent sweet and heartfelt well wishes, while others opted to roast the tech billionaire.

"I can't believe you're 40, you old piece of shit," one unidentified person said.

Representatives for Zuckerberg and Gates did not immediately respond to a request for comment.