List of Famous people who are 21

Lu Yufei is a Chinese artistic gymnast. She is the 2021 Chinese national all-around and floor champion and balance beam silver medalist, and the 2020 Chinese national floor bronze medalist. She is the 2019 Asian Championships uneven bars champion and all-around silver medalist and a member of the gold medal-winning team.

Hwang Pyong-so is a North Korean general and politician who held the rank of Vice Marshal in the Korean People's Army (KPA). He was a member of the Presidium of the Workers' Party of Korea and the top-ranking vice-chairman of the State Affairs Commission.

Marie Le Net is a French road and track cyclist, who currently rides for UCI Women's WorldTeam FDJ Nouvelle-Aquitaine Futuroscope. Le Net won the silver medal in the junior women's road race at the 2018 UCI Road World Championships.

Jun Endo is a Japanese football player. She plays for Nippon TV Beleza and Japan national team.

James Cox Kennedy is an American media executive and the current chair of Cox Enterprises, the conglomerate founded by his grandfather, James M. Cox. According to the 2017 Forbes billionaires list, he is the 105th-richest person in the world, the 37th-richest person in the United States, and the richest person in the state of Georgia, surpassing his aunt, Anne Cox Chambers.