Famous 21 Years Old

Millie Bobby Brown, the English actress and model, rose to prominence after acting in the TV series Stranger Things and then in the film, Godzilla: King of the Monsters, in 2019. She was named one of the 100 most influential people in the world by Time magazine in April 2018, making her the youngest person ever to be so.

Aidan Gallagher is a popular upcoming actor who started acting when he was just ten years old, appearing in an episode of the TV show Modern Family. He is also a singer. Besides his work in the entertainment industry, he is an environmentalist who follows a vegan lifestyle. He was named UN Environment Goodwill Ambassador for North America in 2018.

Jack Dylan Grazer is an actor best known for playing Eddie Kaspbrak in It and its 2019 sequel. One of the most popular child actors, Jack was named among the top 30 stars under the age of 18 by The Hollywood Reporter in 2018. Well-matured for his age, Jack sponsors an annual scholarship for two students at the Adderley School.

Grace VanderWaal is a singer-songwriter who began her career as a YouTuber, uploading videos of her original songs and covers. She also started performing in local shows, gaining attention for her distinctive vocals. She won the TV competition show, America's Got Talent (AGT), in 2016 and received the 2017 Billboard Women in Music Rising Star Award.

Tate McRae became a budding pop star even before she graduated. She started her musical journey at the age of thirteen and since then there has been no stopping. She hogged the limelight for her song One Day. She topped TikTok and Billboard with her single, You Broke Me First. She has also choreographed rseveral music videos and television shows.

Anna Cathcart is a Canadian actress best known for her portrayal of Agent Olympia in the children's live-action TV series Odd Squad, for which she won an award at the seventh annual Canadian Screen Awards. Despite not attending acting classes, Cathcart has managed to establish herself in both the TV and film industry and cites Disney Channel as an inspiration.

Coco Gauff is an American tennis player who became the youngest singles WTA Tour title-holder since 2004 when she won her first WTA title at the 2019 Upper Austria Ladies Linz at the age of 15. Coco Gauff, who has achieved a career-high ranking of 23 in singles, is the youngest player ranked by the WTA in the top 100.

Canadian-American actor-singer and Nashville star Maisy Stella is a teen icon who has gained phenomenal success with her role of Daphne Conrad. She has also been part of the musical duo Lennon & Maisy, along with her sister Lennon Stella. The duo is popular on YouTube, too.

Born in Iran, chess Grandmaster Alireza Firouzja initially represented his country but later began representing France. In 2021, he became the only teenager ranked among the world’s top 15 chess players. A 2-time Iranian champion, he has been a chess prodigy and had started training in chess at age 8.

A successful model and dancer, Brynn Rumfallo rose to fame at the age of ten when she appeared on the eighth season of America's Got Talent as a contestant.  Famed for her contemporary dance styles, she soon won numerous national and regional competitions, concurrently appearing on other television productions before switching to full time modeling.

Leanne Wong is an American artistic gymnast best known for winning a silver medal and a bronze medal at the Artistic Gymnastics World Championships in 2021. In 2019, she was part of the team that won the gold medal in the women's artistic team event at the Pan American Games.   

Amelie Morgan is an English artistic gymnast who won the bronze medal in the women's artistic team all-around event at the 2020 Olympic Games in Tokyo. In 2021, she won the bronze medal in Uneven Bars at the European Women's Gymnastics Championships. Amelie Morgan also had a prolific junior career; she won five medals at the 2018 Junior European Championships. 

Anastasia Bezrukova is a Russian model and actress who began her career as a child. At the tender age of ten, she became one of the most sought-after child models in Europe. Besides modeling for brands like Benetton, Pinko, Moschino, and Incanto, she has also been featured on the cover of Vogue Bambini. She started acting in 2016. 

Kayla DiCello is an American artistic gymnast who won the bronze medal in the all-around event at the Artistic Gymnastics World Championships in 2021. DiCello had a prolific junior career; she won two bronze medals and a gold medal at the Junior World Championships in 2019.