- Aug 1 Landry Allbright, American actress (Bridget Forrester in Bold & Beautiful), born in San Dimas, California
- Aug 2 Alice Connor, British actress, born in Buckinghamshire, United Kingdom
- Aug 3 Jourdan Dunn, British model, born in London, England
- Aug 5 Patrick Reed, American golfer (US Masters 2018), born in San Antonio, Texas
- Aug 6 Jon Benet Ramsey, little beauty queen (murdered in 1996)
- Aug 8 Kane Williamson, New Zealand cricketer (batsman and captain of NZ), born in Tauranga, New Zealand
- Aug 9 Adelaide Kane, Australian actress (Reign), born in Claremont, Australia
- Aug 10 Lucas Till, American actor (MacGyver), born in Fort Hood, Texas
- Aug 12 Mario Balotelli, Italian soccer striker (36 caps; Nice, Inter, Man City), born in Palermo, Italy
DeMarcus Cousins (33 years old)
Aug 13 American basketball player (Sacramento Kings, New Orleans Pelicans), born in Mobile, Alabama
- Aug 14 Jaydee Bixby, Canadian country singer-songwriter (Cowboys And Cadillacs), born in Drumheller, Alberta
Jennifer Lawrence (33 years old)
Aug 15 American actress (Winter's Bone, Silver Linings Playbook), born in Louisville, Kentucky
- Aug 16 Rina Sawayama, Japanese-British singer-songwriter (Sawayama), born in Niigata, Japan
- Aug 17 Colin Bates, American-British actor, dancer, and singer (Billy Elliot - The Musical), born in Pasedena, California
- Aug 17 Rachel Hurd-Wood, British actress (Clique), born in London, England
- Aug 20 Öykü Karayel, Turkish actress (Kuzey Güney), born in Istanbul, Turkey
- Aug 20 Ranomi Kromowidjojo, Dutch-Javanese Surinamese swimmer (Olympic gold 2008, 12), born in Sauwerd, Netherlands
- Aug 21 Bo Burnham, American comedian, singer and filmmaker (All Eyes on Me), born in Hamilton, Massachusetts
- Aug 24 Elizabeth Debicki, Australian actress (The Great Gatsby; Widows; Tenet), born in Paris, France
- Aug 26 Lil' Chris [Hardman], British rock singer ("Checkin' It Out"), born in Lowestoft, Suffolk, England (d. 2015)
- Aug 27 Tori Bowie, American athlete (Olympic gold 4×100 m relay, silver 100m, bronze 200m 2016; World C'ship gold 100m, 4x100m relay 2017), born in Sand Hill, Mississippi (d. 2023)
- Aug 28 Bojan Krkić, Serbian-Spanish footballer, born in Linyola, Spain
- Aug 28 Sam Garret, British singer-songwriter, born in Derbyshire, England
- Aug 29 Sam Stern, British chef and author, born in Yorkshire, United Kingdom
About August 1990
How Old? 33 or 34 years old
Generation: Millennial
Leap Year: No
Greatest Generation
Silent Generation
Baby Boomer
Generation X
Millennial
Generation Z