In this paper, the characteristics of criminal legislation for children in several states are presented and analysed in order to become familiar with their criminal justice systems. On this regard, emphasis is given to the comparative approach of juvenile justice by comparing criminal legislations of some states, such as the juvenile justice of the Republic of North Macedonia, the Republic of Kosovo, the Republic of Albania, the Republic of Croatia, the Netherlands, the Swiss Confederation, Norway, England and Wales, with reference to the following comparative elements: (1) the minimum age of children; (2) minimum age for criminal responsibility of children; and (3) minimum age for the imposition of sentences on children and reaching adulthood; Such comparisons are additionally illustrated in tabular form in order to provide a comprehensible picture to the reader regarding the aforementioned comparisons. Also, in this regard, the three main models of legal-penal treatment of children in different states have been discussed and clarified