6 to 18 years School age is up to 18 but nobody pays attention to the fact that after the age of 8 it is called adolescence.
36
It is said that the average age of a child soldier is 13
There is no average IQ for any age.
Age 3.
9
This would be very hard to find out unless you knew the age of every child in the world.
The average age a child can begin using scissors is suggested to be age two. At age two a child needs to learn how to build up muscles in the palm of his/her hand and start using eye/hand coordination.
the average age is about 11 or twelve...when you hit puberty
23
The grade does not matter it is the average height and the age of the child that determines there weight.
The average IQ for anybody, any age, is 100.
It depends on your area. For example, in California the average age is around 22. In some parts of the world the average could be 28, 19, or even in the 30s.