Yes he is 20, but it is spelled Sterling Knight not Sterlin Knight.
Jean Knight is 68 years old (birthdate: January 26, 1943).
Mark Knight is 38 years old (birthdate: January 8, 1973).
Sterling Knight is 29 years old (birthdate: March 5, 1989).
US actor Christopher Knight is 60 years old (birthdate: November 7, 1957).
US actor Wayne Knight is 62 years old (birthdate: August 7, 1955).
Yakov Abramovich Sterlin has written: 'Tsentralizatsiya i mekhanizatsiya bukhgalterskogo ucheta na predpriyatiyakh zheleznykh dorog'
Wyatt Knight is 56 years old (birthdate: January 20, 1955).
Jean Knight is 68 years old (birthdate: January 26, 1943).
Mark Knight is 38 years old (birthdate: January 8, 1973).
Brevin Knight is 35 years old (birthdate: November 8, 1975).
Robert Knight is 66 years old (birthdate: April 24, 1945).
Gillian Knight is 83 years old (birthdate: November 1, 1934).
Travis Knight is 36 years old (birthdate: September 13, 1974).
Katherine Knight is 55 years old (birthdate: October 24, 1955).
Leon Knight is 28 years old (birthdate: September 16, 1982).
Naomi Knight is 30 years old. She was born on November 30, 1987.
Brandon Knight is 26 years old (birthdate: December 2, 1991).