List of Famous people who are 21

Dominick Martin, better known by his stage name Calibre, is a Northern Irish drum and bass music producer and DJ from Belfast. He started producing at a young age. He is a classically trained musician, playing a variety of musical instruments. Martin started producing Drum and Bass in 1995 and his first signed release was credited under the now defunct Quadrophonic record label.

Jill Ann Sprecher is an American film director, producer and writer. Sprecher collaborates on her film projects with her sister, Karen Sprecher, who writes. Sprecher's films have starred Matthew McConaughey, Lisa Kudrow, and Greg Kinnear. She is known for her films Clockwatchers and Thirteen Conversations About One Thing and her contributions to Big Love on HBO. Her films feature stories about realistic human experiences and the struggles of women.

Choi Bo-min, professionally known by the mononym Bomin, is a South Korean singer, actor and host. He is a member of Golden Child. He made his acting debut with a lead role in the web-drama A-TEEN 2 (2019) and hosted the KBS music program Music Bank from July 5, 2019 to July 17, 2020.

Matthew Jonathan Rosseinsky FRS is Professor of Inorganic Chemistry at the University of Liverpool. He was awarded the Hughes Medal in 2011 "for his influential discoveries in the synthetic chemistry of solid state electronic materials and novel microporous structures."

Stephen Carl Milne is an American mathematician who works in the fields of analysis, analytic number theory, and combinatorics.

Dean S. Karlan is an American development economist. He is Professor of Economics and Finance at Northwestern University and the co-director of the Global Poverty Research Lab at the Buffett Institute for Global Studies. He is a Research Fellow and member of the Executive Committee of the Board of Directors at the Abdul Latif Jameel Poverty Action Lab (J-PAL) at the Massachusetts Institute of Technology. Karlan is also the president and founder of Innovations for Poverty Action (IPA), a New Haven, Connecticut, based research outfit dedicated to creating and evaluating solutions to social and international development problems. Along with economists Jonathan Morduch and Sendhil Mullainathan, Karlan served as director of the Financial Access Initiative (FAI), a consortium of researchers focused on substantially expanding access to quality financial services for low-income individuals. He is also a co-founder of stickK.com and co-founder of ImpactMatters.