How fast does hair grow for 13 years old kid?

my brother has really bad haircut, he looks like monah (2 inches longer than this http://www.oldmaglib.com/pictures/p/Pite...

and he wants to grow his hair to shoulders, and I am interested how long will it take for 13 years old kid?

How fast does hair grow for 13 years old kid?

hair grows the same no matter what age you are.. average about 1/2 inch a month or 6 inches a year...

Answer please-

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How fast does hair grow for 13 years old kid?

hair grows 1/2 inch each month

How fast does hair grow for 13 years old kid?

6 or 7 inches a year