List of Famous people who are 21

Rhian Joel Brewster is an English professional footballer who plays as a striker for Premier League club Sheffield United and the England national under-21 team. In 2017, he was part of the England squad which won the 2017 FIFA U-17 World Cup in India and was awarded the Golden Boot award for ending as the competition's leading goalscorer.

Rikako Ikee is a Japanese competitive swimmer. She is the national record holder in the 50-meter freestyle and the 100-meter butterfly, and the junior world record holder in the 50-meter freestyle and 50-meter butterfly long-course events, and the 50- and 100-meter butterfly, and 100-meter individual medley in short course.

Kaori Sakamoto is a Japanese figure skater. She is the 2018 Four Continents champion, the 2020 NHK Trophy champion, a two-time Skate America silver medalist, the 2018 Grand Prix of Helsinki bronze medalist, the 2019 Japanese national champion, and a two-time Japanese national silver medalist. She placed 6th at the 2018 Winter Olympics.

Chen Linong is a Taiwanese singer and actor active in mainland China. He took part in the Chinese survival show Idol Producer and debuted as a member of Chinese boy group Nine Percent as a vocalist. He released his first album 'Unbelonging' on May 29, 2020.

Etienne Green is an English professional footballer who plays as a goalkeeper for Ligue 1 club Saint-Étienne.

John Francis Kirby is a retired rear admiral in the United States Navy who currently serves as the Pentagon Press Secretary and Assistant Secretary of Defense for Public Affairs. He previously served as a military and diplomatic analyst for CNN from 2017 to 2021. Prior to that, he served as the spokesperson for the United States Department of State from 2015 to 2017. In 2021, Kirby joined the Pentagon as Assistant Secretary of Defense for Public Affairs and concurrently as Spokesperson for the Department of Defense.

(G)I-dle, stylized as (G)I-DLE, is a South Korean multinational girl group formed by Cube Entertainment in 2018. The group consists of six members: Miyeon, Minnie, Soojin, Soyeon, Yuqi, and Shuhua. The group debuted on May 2, 2018, with their first extended play titled I Am and its lead single "Latata". A year later, the group debuted in Japan on July 31, 2019, under U-Cube with Latata.

Arthur Nicolas Theate is a Belgian professional footballer who plays as a defender for Serie A club Bologna, on loan from Oostende. He also represents the Belgium national team.

Jean-Clair Dimitri Roger Todibo is a French professional footballer who plays as a centre-back for Primeira Liga club Benfica on loan from Barcelona.

Konrad de la Fuente is an American professional soccer player who plays as a winger for Spanish team FC Barcelona B.