The definition of children and young people varies.
In the European Union, children are defined as people from birth up to 18 years of age. The definition due to EU
In The World Health Organization, a child is a person 19 years or younger unless a national law defines a person to be an adult at earlier ages. When a person falls into the 10 to 19 age category they are referred to as an adolescence. The definition according to WHO.