List of Famous people who are 21

Ariarne Titmus is an Australian swimmer. She currently represents the Cali Condors which is part of the International Swimming League. In 2015, Titmus and her family moved from Tasmania to Queensland for better training opportunities. She competed in the women's 200 metre freestyle event at the 2017 World Aquatics Championships.

Ragan Elizabeth Smith is an American collegiate gymnast. She is a five-time member of the US National Team (2014–2019). She is the 2017 United States national all-around champion and was an alternate for the 2016 Olympic team.

Angelina Romanovna Melnikova is a Russian artistic gymnast. She represented Russia at the 2016 Summer Olympics, winning a silver medal in the team competition. She was also a member of the gold medal-winning Russian teams at the 2016 and 2018 European Championships, and the silver medal-winning Russian teams at the 2018 and 2019 World Championships.

Kouassi Ryan Sessegnon is an English professional footballer who plays as a left back or left winger for German Bundesliga club Hoffenheim on loan from Tottenham Hotspur and the England under-21 national team.

Vincent Zhou is an American figure skater. He is the 2019 World bronze medalist, the 2019 Four Continents bronze medalist, the 2018 CS Tallinn Trophy silver medalist, the 2017 CS Finlandia Trophy silver medalist, and a three-time U.S. national silver medalist.

Ouyang Nana is a Taiwanese musician and actress, known for her musical talent, coming of age romance film Secret Fruit, and the cyberpunk action film Bleeding Steel.

Hina Hayata is a Japanese international table tennis player. She is the most successful player on the ITTF Challenge Series since its inception in 2017. Owing to her stature, she is able to generate powerful spins on both wings more so than most female players.

Mohamed Simakan is a French professional footballer who plays as a defender for Bundesliga club RB Leipzig.

Anaïs Oluwatoyin Estelle Marinho, known professionally as Arlo Parks, is a British singer-songwriter and poet. After signing to Beatnik Creative in 2018, she released her debut single "Cola", which preceded the EPs Super Sad Generation (2019) and Sophie (2019). Parks released her debut studio album, Collapsed in Sunbeams, through Transgressive Records in January 2021.

Bryan Kevin Porter Jr. is an American professional basketball player for the Houston Rockets of the National Basketball Association (NBA), on assignment to Rio Grande Valley Vipers of the NBA G-League. He played high school basketball for Rainier Beach High School and led the Vikings to the state playoffs in each of his four years. He played college basketball for the USC Trojans.