How tall is an average 12 year old?

First of all it would be how tall should A 12 year old be

and I'm 12 I'm like 5'2 but I'm a tad short compared to my friends...but most of my friends are 13 because i started school early. it is kind of odd because I'm 12 and 5'2 yet the 6th graders at my school are also my age (or older) and there like 4'9 ish :) hope that helped