True:
Being exactly as appears or as claimed.

Example:
One of a group or collection that shows what the whole is like.

How old is Justin Bieber?

Born in Stratford, Ontario, Canada. Date: March 1, 1994

This means Justin Bieber is 18 years old and will be 18 years old until March 1st, 2012.

His full name is: Justin Drew Bieber.