List of Famous people who are 21

Edouard F. Henriques is a make-up artist. He has over 70 film and TV credits.

S. Cofré is or was a Chilean astronomer of the University of Chile, and co-discoverer of 11 minor planets together with Chilean astronomer Carlos Torres from the Cerro El Roble astronomical observatory, Chile, in 1968. One of her co-discoveries is the 10-kilometer sized inner main-belt asteroid and member of the Eos family, 1992 Galvarino, named for the 16th century Mapuche warrior.

Michael Tiemann is vice president of open source affairs at Red Hat, Inc., and former President of the Open Source Initiative.

Conor O'Sullivan is a British prosthetic makeup artist who has been nominated for two Academy Awards, who is perhaps best known for being one of the makeup artists in The Dark Knight who was involved in creating The Joker's makeup.

"Ghost Rider" is the alias used by a Swedish motorcycle stunt rider, called "probably the most famous flaunter of road rules the world has ever seen", whose YouTube videos have achieved a "cult following" with millions of views.