- Jan 4 Gage Munroe, Canadian actor (I Declare War), born in Toronto, Ontario
- Jan 10 Mason Mount, English footballer (England, Chelsea FC), born in Portsmouth, England
- Jan 13 Nasa Hataoka, Japanese golfer (Women's PGA C'ship 2018 runner-up), born in Ibaraki, Japan
- Jan 18 Karan Brar, American actor (Diary of a Wimpy Kid; Bunk'd), born in Redmond, Washington
- Jan 19 Christone “Kingfish” Ingram, American Blues guitarist and singer (662), born in Clarksdale, Mississippi
- Jan 29 Madison Bailey, American actress (Outer Banks), born in Kernersville, North Carolina
- Feb 16 Marie Ulven, Norwegian alt-pop-rock singer-songwriter, guitarist, and record producer (girl in red), born in Horten, Norway
- Feb 28 Luka Dončić, Slovenian basketball guard (EuroLeague MVP 2018; NBA Rookie of the Year 2019; Dallas Mavericks), born in Ljubljana, Slovenia
- Mar 4 Brooklyn Beckham, English model and photographer (son of David and Victoria Beckham), born in London, England
- Mar 12 Janja Garnbret, Slovenian competitive climber, born in Slovenj Gradec, Slovenia
- Mar 13 Wiktoria Gąsiewska, Polish actress, born in Warsaw, Poland
- Mar 14 Marvin Bagley III, American NBA player (Detroit Pistons), born in Temple, Arizona
- Mar 19 Tatum McCann, American actress
- Mar 23 Prince Beltran of Bulgaria
- Apr 2 Audrey Nuna [Chu], Korean-American R&B singer and rapper ("Comic Sans"), born in New Jersey
- Apr 3 Sam Kiszka, American bass player (Greta Van Fleet), born in Frankenmuth, Michigan
Lil Nas X (23 years old)
Apr 9 American singer-songwriter and rapper (Old Town Road), born in Lithia Springs, Georgia
- Apr 14 Chase Young American NFL player (Washington Commanders), born in Upper Marlboro, Maryland
- May 11 Sabrina Carpenter, American actress (Girl Meets World) and singer, born in Lehigh Valley, Pennsylvania
- May 23 James Charles [Dickinson], American internet personality and model (Cover Girl), born in Bethlehem, New York
- May 25 Brec Bassinger, American actress (Stargirl), born in Saginaw, Texas
- May 27 Lily-Rose Depp, French-American singer and actress (The Dancer), born in Neuilly-sur-Seine, France
- May 28 Cameron Boyce, American actor (Mirrors, Jessie), born in North Hollywood, California (d. 2019)
- May 30 Guanyu Zhou, Chinese racing driver (first Chinese F1 driver), born in Shanghai, China
- May 30 Sean Giambrone, American actor (The Goldbergs - "Adam"), born in St. Joseph, Michigan
- Jun 16 Snail Mail [Linsey Jordan], American indie-rock guitarist and singer-songwriter, born in Ellicott City, Maryland
- Jun 17 Elena Rybakina, Kazakhstani tennis player (Wimbledon women's singles 2022), born in Moscow, Russia
- Jun 27 Chandler Riggs, American actor (The Walking Dead), born in Atlanta, Georgia
- Jul 20 Pop Smoke [Bashar Barakah Jackson], American rapper and singer-songwriter (Shoot for the Stars, Aim for the Moon), born in Brooklyn, New York (d. 2020)
- Jul 20 Princess Alexandra of Hanover, daughter of Princess Caroline of Monaco
- Aug 2 Mark Lee, Canadian rapper and singer (NCT; SuperM), born in Toronto, Ontario
- Aug 7 Sydney McLaughlin, American hurdler and sprinter, born in New Brunswick, New Jersey
- Aug 28 Prince Nikolai of Denmark, born in Copenhagen, Denmark
- Sep 13 Destiny Rogers, American pop and R&B singer ("Tomboy"), born in Lodi, California
- Sep 28 Olivia Jade Giannulli, American Youtuber (daughter of Mossimo Giannulli and Lori Loughlin)
- Sep 29 Juan Valentín Urdangarín y de Borbón, Spanish royal, son of Infanta Cristina de Borbon, born in Barcelona, Spain
- Oct 11 Patty Tavatanakit, Thai golfer (ANA Inspiration 2021), born in Bangkok, Thailand
NBA YoungBoy (23 years old)
Oct 20 American rapper ("Bandit"; Tyler the Creator -"WusYaName"), born in Baton Rouge, Louisiana
Kiernan Shipka (23 years old)
Nov 10 American actress (Sally Draper -Mad Men), born in Chicago, Illinois
- Nov 11 Samara Joy [McLendon], American jazz singer, born in Bronx, New York
- Nov 13 Lando Norris, British auto racer (Karting World C'ship 2014; FIA Formula 3 European C'ship 2017; McLaren F1 2018- ), born in Bristol, England
- Nov 20 Prince Umberto of Bulgaria, titular Bulgarian royal family
- Nov 20 Princess Sofia of Bulgaria, titular Bulgarian royal family
- Nov 22 Umran Malik, Indian cricketer, born in Srinagar, India
- Dec 16 Ethan Dolan, American Vine and YouTube star with twin brother Grayson, born in New Jersey
- Dec 16 Grayson Dolan, American Vine and YouTube star with twin brother Ethan, born in New Jersey
- Dec 17 Holly Humberstone, English singer-songwriter ("The Walls Are Way Too Thin"), born in Grantham, England
About 1999
How Old? 23 or 24 years old
Generation: Generation Z