Justin bieber was 15 when one time was released
Justin Bieber was 9 years old when he sang one time that was the reason why him voice was so high. :)
12! Justin Bieber did not write the song "One Time" -- he sung it. He was 15 years old when the song was released.
The girl as Justin's "love interest", Kristen Leanne Rodeheaver was 15 years old when she was in Justin Bieber's single One Time.
The girl was 16 years old i think when she was in One Time by Justin Bieber, I think now she is 17 not quite sure
He was 15.
He was 15
14 years old.
He was 12 when he made the video
15 years old
Justin Bieber's debut single is "One Time".
he was 15