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Bill Gates, left, and Mark Zuckerberg in a recreation of the Facebook founder’s Harvard University dorm room. (Instagram Photo via @zuck)

Bill Gates left Harvard to start Microsoft. Mark Zuckerberg dropped out of Harvard to concentrate on Facebook.

But the two tech moguls made it back to school for a reunion of sorts, posing in a recreated, small-scale dorm room to celebrate Zuckerberg’s 40th birthday this week.

Dressed in gym shorts, running shoes, and a hoodie, Gates is shown (above, and in the second image in the gallery below) seated on a tiny couch next to Zuckerberg, who is seated at a small desk with a laptop. He’s wearing a gold chain and a black T-shirt with the phrase Carthago delenda est on it.

The room is one of several put together by Zuckerberg’s wife, Priscilla Chan, to celebrate the places where her husband lived over the years.

Other rooms at his party included his childhood bedroom where he says he learned to code; his first apartment, with just a mattress on the floor, where Zuckerberg says he stayed until Facebook reached 100 million people; an office where he was locked down while working “day and night to fight off competitors”; and a pizza place in Harvard Square where Zuckerberg “basically lived in college.”

Even though @zuck tagged @thisisbillgates in the image and thanked him for being a special guest in the dorm room, we couldn’t help but think, in this age of AI fakery, that perhaps the Microsoft co-founder didn’t really attend the Meta maker’s party.

But Gates did share the image and a “Happy Birthday, @zuck!” message on his own Instagram Stories. And a rep for Gates Ventures confirmed to GeekWire that the image is in fact real.