List of Famous people who are 21

Brian A. Skiff is an American astronomer noted for discovering numerous asteroids and a number of comets including the periodic comets 114P/Wiseman–Skiff and 140P/Bowell–Skiff.

Jagdish Koonjul was the Mauritian Ambassador and former President of the United Nations Security Council in January 2002.

Willie C. Carpenter is an American actor. He is perhaps best known for his recurring roles on Reasonable Doubts as Robert Maxwell, 1600 Penn as General Maurer, and Devious Maids as Kenneth Miller.

Ra Vincent is a New Zealand production designer, set decorator and artist. He is best known for his work on The Hobbit trilogy (2012–2014) and Jojo Rabbit (2019). His accolades include a Hollywood Film Award and a Saturn Award, in addition to nominations for a BAFTA Award, two Academy Awards and two Critics' Choice Movie Awards.

David H. D. Warren is a computer scientist who worked primarily on logic programming and in particular the programming language Prolog in the 1970s and 1980s. Warren wrote the first compiler for Prolog, and the Warren Abstract Machine execution environment for Prolog is named after him.