List of Famous people who are 21

Paul Young is the CEO of Cartoon Saloon, a four-times nominated Academy award and BAFTA nominated Irish animation studio. He co-founded the studio in 1999 with Tomm Moore and Nora Twomey. Young is also a producer and an award-winning illustrator and cartoonist. In 2015 he was a finalist in the Ernst & Young Entrepreneur of the Year Award. He is on the board of Animation Ireland.

Jason Smith is an American visual effects supervisor, who graduated from BYU's Computer Science Animation program. Best known for his work on various blockbuster feature film projects such as Star Wars: Episode III – Revenge of the Sith (2005), Harry Potter and the Goblet of Fire (2005), The Avengers (2012), and The Revenant (2015).

Wang Chuqin is a Chinese table tennis player. He won Gold in the men's singles and mixed team events at the 2018 Youth Olympic Games in Buenos Aires, Argentina.