List of Famous people who are 21

Carl Eddie Hewitt is an American computer scientist who designed the Planner programming language for automated planning and the actor model of concurrent computation, which have been influential in the development of logic, functional and object-oriented programming. Planner was the first programming language based on procedural plans invoked using pattern-directed invocation from assertions and goals. The actor model influenced the development of the Scheme programming language, the π-calculus, and served as an inspiration for several other programming languages.

Atsushi Sugie is a Japanese astronomer and a discoverer of minor planets. He works at the Dynic Astronomical Observatory and has discovered many planets while working there. The Minor Planet Center credits him with the discovery of 122 numbered minor planets during 1988–2000.

Gerry Lively is a cinematographer and film director, known for directing Darkness Falls (1999), Dungeons & Dragons: Wrath of the Dragon God (2005) and Body Armour (2007).

Tina Earnshaw is an Oscar- and BAFTA-nominated British make-up designer and the founder of Tina Earnshaw Cosmetics. She has designed the make up looks on some of the world's most successful films, including Titanic, for which she was nominated for an Academy Award, alongside Greg Cannom and Simon Thompson.

Graham Neil Broadbent is a British film producer, affiliated with Guernsey Productions Limited and with Blueprint Pictures (Marigold) Ltd.

Robert Q. Lovett is a film editor who was nominated at the 57th Academy Awards in the category of Best Film Editing for his work on The Cotton Club. He also participated in the Festival De Cannes for A Bronx Tale, directed by Robert De Niro in 2011. He worked on over 30 films and TV shows from 1963 to 2006.