How tall was Justin bieber when he was 13 years old?

At age 13, Justin Bieber was around 4'8 and grew to be around 4'10 before turning 14.

At age 14, he went from 4'10 to 5'0. (2007 - 2008)

Age age 15, he went from 5'0 to around 5'2. (2008 - 2009)

Age age 16, he went from 5'2 to 5'4. (2009 - 2010)

Like most 16 year old boys, he stopped growing (in 2010) so at age 17, he'll still be around 5'4. (2010 - 2011)

So overall, he's grown a total of about 8 inches since age 13.