List of Famous people who are 21

Yacine Adli is a French professional footballer who plays as an attacking midfielder for Ligue 1 club FC Girondins de Bordeaux.

Jakob Ingebrigtsen is a Norwegian middle-distance runner. He won two gold medals at the 2018 European Championships, in the 1500 and 5000 metres events. On 20 July 2019, at the London Diamond League, Ingebrigtsen broke Norway's national record in the 5000 m with his time of 13:02.03. His older brothers Henrik and Filip are also middle-distance runners who compete internationally. They are trained by their father Gjert Ingebrigtsen. On 12 October 2019, he was the youngest pacemaker in the successful sub-2 hour marathon attempt by Eliud Kipchoge.

Doña Victoria Federica de Todos los Santos de Marichalar y Borbón is the younger child and only daughter of the Spanish Infanta Elena, Duchess of Lugo, and Don Jaime de Marichalar. She is fifth in the line of succession to the Spanish Throne, after her brother Felipe.

Matthew Ben Longstaff is an English professional footballer who plays as a midfielder for Premier League club Newcastle United.

Christian Malheiros is a Brazilian actor. He is known for his award-winning performance in the 2018 drama film Sócrates, which was praised by critics and earned him a nomination for Best Male Lead at the 34th Independent Spirit Awards.

Michael Oluwadurotimi Obafemi is an Irish professional footballer who plays as a striker for Premier League club Southampton.

Marius Yo is a Japanese singer, songwriter, actor and tarento under Johnny & Associates and Pony Canyon. He is a member of the boy band Sexy Zone.

Jasmine Ying Thompson is an English singer and songwriter. Thompson began her career at the age of ten by filming herself singing and uploading the videos to YouTube. In 2014, she was featured on German deep house producer Robin Schulz's song "Sun Goes Down", which charted within the top 10 in multiple countries including Australia, Germany, Austria, and Switzerland. As of March 2019, her YouTube channel has amassed over 3.3 million subscribers and over 570 million views.

Jaren Lewison is an American actor, best known for portraying Ben Gross in the television series Never Have I Ever.

Mel Metcalfe is an American sound engineer. He has been nominated for an Academy Award in the Best Sound category three times: in 1987, for Star Trek IV: The Voyage Home; in 1992, for Beauty and the Beast; and in 1993, for Aladdin.