List of Famous people who are 21

Kriv Stenders is an Australian writer, producer and director best known for the film Red Dog and the thriller film Kill Me Three Times.

Ian Hunter is a visual effects artist. He won two Academy Awards for Best Visual Effects for the 2014 film, Interstellar, at the 87th Academy Awards in 2015 and for the 2018 film, First Man, at the 91st Academy Awards in 2019.

Pamela M. Kilmartin is a New Zealand astronomer and a co-discoverer of minor planets and comets.

Megumi Tachikawa is a Japanese shōjo manga artist, best known for the manga Saint Tail, which was also adapted into an anime series. She made her manga debut in 1992 with 16-sai no Tiara, which was nominated for the 'New Face' manga award.

Brian Howe is an American actor known for his portrayal of stockbroker Jay Twistle in the film The Pursuit of Happyness.

Dick Alexander is an American sound engineer. He won two Academy Awards for Best Sound and was nominated for six more in the same category. He has worked on over 170 films and television shows since 1975.

Torbjörn Sjöstrand is a Swedish theoretical physicist and a professor at Lund University in Sweden, where he also got his PhD in 1982. He is one of the main authors of PYTHIA, a program for generation of high-energy physics events. In 2012, he was awarded the Sakurai Prize by the American Physical Society.