List of Famous people who are 21

Andy Nicholson is an English production designer who has worked on various films, including Gravity, Divergent, Assassin's Creed, and Jurassic World: Fallen Kingdom. Nicholson has also worked as an art director for numerous films, including several by director Tim Burton.

Rhett Reese is an American film producer, television producer, and screenwriter. As a screenwriter, his early credits included Clifford's Really Big Movie and Cruel Intentions 3. He has collaborated with Paul Wernick, writing the films Zombieland, G.I. Joe: Retaliation, and Life, as well as Deadpool and its 2018 sequel. Together they also created the reality series The Joe Schmo Show.

Jeffrey Henderson Smith is a former professor of mathematics at Purdue University in Lafayette, Indiana. He received his Ph.D. from the Massachusetts Institute of Technology in 1981, under the supervision of Daniel Kan, and was promoted to full professor at Purdue in 1999. His primary research interest is algebraic topology; his best-cited work consists of two papers in the Annals of Mathematics on "nilpotence and stable homotopy".

Tony Burrough is a production designer known for his work on the 1995 film Richard III.