how old is kalani
1 Nia: 15 years old â¢ (born June 20, 2001) 2  Kendall: 13 years old â¢ (born December 9, 2002) 3  Kalani: 15 years old â¢ (born September 23rd, 2000)  JoJo: 13 years old â¢ (born May 19, 2003)