Mark Zuckerberg's Birthday T-Shirt: Decoding "Carthago Delenda Est". Mark Zuckerberg's 40th birthday bash got tongues wagging, not just for the recreated dorm room nostalgia, but for his choice of attire. A simple black shirt emblazoned with the Latin phrase "Carthago delenda est" stole the show. But what exactly does it mean, and why did Zuck choose this for his milestone birthday?