List of Famous people who are 21

Alison Brendom Alves dos Santos is a Brazilian athlete specialising in the 400 metres hurdles. He won a bronze medal at the 2018 World U20 Championships, was champion of the 2019 Pan American Games, finalist of the 2019 World Championships and is currently the South American record holder in the competition.

Fan Chengcheng is a Chinese singer and rapper. He was a member of the Chinese boy group, Nine Percent debuted on 6 April 2018, and is currently a member of Yuehua's NEX7.

Daryl Dike is an American soccer player who plays for Barnsley of the EFL Championship, on loan from Orlando City of MLS. Dike played college soccer for the University of Virginia and was selected in the first round of the 2020 MLS SuperDraft by Orlando City having already signed a Generation Adidas contract. He is the most recent recipient of the offensive category for the NCAA Division I Men's Soccer Tournament Most Outstanding Player.

Julia Angela Grosso is a Canadian soccer player who plays as a midfielder. She plays for the Texas Longhorns in the Big 12 Conference. Grosso also plays for the Canada women's national soccer team. She scored the gold medal winning penalty in the 2020 Tokyo Olympics.

Sacha Boey is a cameroonian professional footballer who plays as a right-back for Süper Lig club Galatasaray and the Cameroon national football team.

Julia Reichert is an Academy Award-winning American documentary filmmaker and radical feminist.

Michael Houghton is a British scientist and Nobel Prize laureate. Along with Qui-Lim Choo, George Kuo and Daniel W. Bradley, he co-discovered Hepatitis C in 1989. He also co-discovered the Hepatitis D genome in 1986. The discovery of the Hepatitis C virus (HCV) led to the rapid development of diagnostic reagents to detect HCV in blood supplies, which has reduced the risk of acquiring HCV through blood transfusion from one in three to about one in two million. It is estimated that antibody testing has prevented at least 40,000 new infections per year in the US alone and many more worldwide.

Susilo Wonowidjojo is an Indonesian billionaire businessman.

Nina Derwael is a Belgian artistic gymnast and Olympian. She is a two-time World champion and a two-time European champion on the uneven bars as well as a two-time Belgian national all-around champion. She is the first Belgian gymnast to become a world champion.

Elizabet Tursynbaeva is a Kazakh retired figure skater. She is the 2019 World silver medalist, the 2019 Four Continents silver medalist, the 2017 CS Ice Star champion, the 2018 CS Finlandia Trophy silver medalist, the 2015 CS Golden Spin of Zagreb silver medalist, the 2019 Winter Universiade silver medalist, and a three-time Kazakhstani national champion (2015-2017). She placed 12th at the 2018 Winter Olympics. Having successfully landed a quadruple Salchow at the 2019 World Figure Skating Championships, Tursynbaeva is the first female skater to land a quadruple jump in senior competition.