- Sep 8 Shubman Gill, Indian cricketer (Gujarat Titans, India), born in Farzilka, Punjab, India
- Sep 13 Destiny Rogers, American pop and R&B singer ("Tomboy"), born in Lodi, California
- Sep 22 Kim Yoo-jung, South Korean actress (20th Century Girl), born in Seoul, South Korea
- 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
About September 1999
How Old? 24 years old
Generation: Generation Z
Leap Year: No
Year of the Rabbit
Year of the Dragon
Year of the Snake
Year of the Horse
Year of the Goat/Sheep
Year of the Monkey