List of Famous people who are 21

Lee Yu-rim is a South Korean badminton player who was educated at Janggok High School in Shiheung. She was a gold medallist in the girls' doubles event at the 2017 Asian Junior Championships and the World Junior Championships with Baek Ha-na. Among their key results in senior events, Lee and Baek reached the final at the 2017 Macau Open, but lost to Chinese pair Huang Yaqiong and Yu Xiaohan with the score 10–21, 17–21.

Mike Baron is an American comic book writer. He is the creator of Badger and the co-creator of Nexus with Steve Rude.

Michael Kaplan is an American costume designer for film. Born in Philadelphia, Pennsylvania, Kaplan has been working in the Hollywood film industry since the 1978 film "Thank God It's Friday".

Stylianos (Stelios) Constantas is a Cypriot-born singer. He participated in two Cypriot national finals for the Eurovision Song Contest, coming second in 1997 with I grammitis ntropi, and fourth in 1999 with Methysmeno feggari. In 2003, he performed the song "Feeling Alive" as the Cypriot entry for the Eurovision Song Contest, finishing 20th in the competition. He has released one album and a single through V2 Records.

Naoki Hisaya , born Naoki Hayashi , is a Japanese screenwriter who has worked for Tactics, Key and Siesta, but as of 2006, he is a freelance writer. He is well known for being the main writer of the popular visual novel Kanon while working under Key. Additional works include Moon, One: Kagayaku Kisetsu e, and Moon Childe. He is also known for being the original concept writer for Sola and Sora no Method. He later wrote the scenario for the action role-playing game Crystar. He also does work in a dōjin circle named Cork Board.

Debra Hayward is a British film producer. As Head of Film at Working Title Films, Hayward frequently served as an executive producer for the company's feature films, working alongside fellow Working Title executive Liza Chasin. After producing Les Misérables, she started her own production company; Monumental Pictures.

Robert Lorenz is an American film producer and director, best known for his collaborations with Clint Eastwood. He has been nominated for the Academy Award for Best Picture three times, for Mystic River (2003), Letters from Iwo Jima (2006), and American Sniper (2014). He has also directed Trouble with the Curve (2012) and The Marksman (2021).