This question is vague. Do you mean Justin Beiber and if so 1994 is the answer which means he's currently 17 years old. Please in the future, research before you go and ask a silly question that is easily answered by looking it up and it only takes a few seconds. Just to save other people's time and your own time.
Thankyou
JB Danquah was born in Ghana
JB Straubel was born in 1975.
JB was born on the 7th of December.
JB Magsaysay was born on July 6, 1980.
JB Baretsky was born on 1987-06-09.
JB Carlson was born on 1974-02-16.
JB Blanc was born on February 13, 1969, in Paris, France.
JB Reynolds was born on May 23, 1979, in Chicago, Illinois, USA.
JB Warren was born on March 25, 1967, in Midland, Michigan, USA.
JB Pritzker was born on January 19, 1965
JB Tadena was born on May 3, 1983, in Los Angeles, California, USA.
Jb- 1986 Aston- 1988 Marvin-1985 Oriste- 1986