List of Famous people who are 21

Richard Thomas Marotta is an American drummer and percussionist. He has appeared on recordings by leading artists such as Aretha Franklin, Carly Simon, Steely Dan, James Taylor, Paul Simon, John Lennon, Hall & Oates, Stevie Nicks, Wynonna, Roy Orbison, Todd Rundgren, Roberta Flack, Peter Frampton, Quincy Jones, Jackson Browne, Al Kooper, Waylon Jennings, Randy Newman, Peter Gabriel, Kenny G, The Jacksons, Crosby, Stills & Nash, Warren Zevon, and Linda Ronstadt. He is also a composer who created music for the popular television shows, Everybody Loves Raymond and Yes, Dear.

Rhiannon Wryn is an American actor. She had lead roles in the 2007 film The Last Mimzy and the 2010 film Monster Mutt. She was nominated for both a Saturn Award and a Young Artist Award for her performance in The Last Mimzy.

Jeffrey Thomas is a British-born New Zealand actor and writer, best known for his film, television and stage roles.

Stephen McCole is a Scottish actor. He is best known for starring in the dark comedy series High Times, the American comedy Rushmore, and for his former role in BBC Scotland soap opera River City.

Scott R. Fisher is an American visual effects artist.