List of Famous people who are 21

Nahed Taher is Saudi businesswoman, founder and chief executive officer of Gulf One Investment Bank, which has its headquarters in Bahrain.

Hu Xianxu is a Chinese actor.

Suzuka Hasegawa is a Japanese swimmer. She competed in the women's 200 metre butterfly event at the 2016 Summer Olympics. In April 2017, Hasegawa broke the world junior record in the 200 butterfly with a 2:06.29 at Japanese Nationals.

Shōji Satō is a Japanese manga artist and illustrator. He has also published various dōjinshi under the pen name Inazuma and runs an erotic genre group called Digital Accel Works. He is responsible for the character design and illustration for the Highschool of the Dead manga. He is the former assistant of Kōshi Rikudō, the creator of the popular manga series Excel Saga.

Sheikh Khalid bin Saqr Al Qasimi is the former Crown Prince and Deputy Ruler of the Emirate of Ras Al Khaimah, the northernmost Emirate of the United Arab Emirates. He is the eldest son of Sheikh Saqr bin Mohammed Al Qasimi, who ruled Ras Al Khaimah from 1948 until his death in 2010.

Martin Kierszenbaum, also known by his pseudonym Cherry Cherry Boom Boom, is an American music personality. As a songwriter and producer he worked with Lady Gaga, Sting, Madonna, Mylène Farmer, Keane, Tokio Hotel, Far East Movement, Robyn, Feist, Flipsyde, Ivy Levan, Ai, Samantha Fish, Alexandra Burke and Natalia Kills. He owns The Cherrytree Music Company which developed the careers of Lady Gaga, LMFAO, Disclosure, Ellie Goulding, La Roux and t.A.T.u.. Kierszenbaum also releases music under his own name and under his nickname Cherry Cherry Boom Boom.