List of Famous people who are 21

Julian Doyle is a British filmmaker who is best known for his work as a longtime collaborator on the films of Monty Python, including effects photography for Monty Python and the Holy Grail, and editing Monty Python's Life of Brian and Monty Python's The Meaning of Life, as well as directing the second-unit on the Python affiliated films The Rutles: All You Need Is Cash, Erik the Viking, The Wind in the Willows, and Absolutely Anything. He also edited and shot the special effects for Terry Gilliam's films Brazil and Time Bandits.

Liang Weikeng is a Chinese badminton player. In 2018, he won two gold medals in two events at the World Junior Championships in Markham and the Asia Junior Championships in Jakarta. He won his first World Tour title at the 2022 Japan Open with Wang Chang.

Peter J. Devlin is an American sound engineer. He has been nominated for four Academy Awards in the category Best Sound. He has worked on over 50 films since 1988.

Toshimasa Furuta is a Japanese astronomer. He is a prolific discoverer of asteroids.

Mike Johnson is an American stop motion animator who has worked on films such as James and the Giant Peach and The Nightmare Before Christmas, short films such as an animation of "The Devil Went Down to Georgia", and TV programmes such as The PJs. He is best known for directing Corpse Bride with Tim Burton; they were jointly nominated for the 2005 Academy Award for Best Animated Feature. He was set to direct Ping Pong Rabbit, from a script by Peter Barsocchini. The film was planned to be released by Mili Pictures Worldwide. Johnson was also attached to direct Oz Wars, a CGI/Stop-motion hybrid film.