In the Netherlands, persons under the age of 18 years are considered minors by law (Burgerlijk Wetboek/Civil Code). From 18 years people are considered adults.
In Dutch youth policy, youth is generally defined as the age group 0-25 years. Within this age group a distinction is made (in policy, not in laws) between Children (0-12 years), Young people (12-18 years) and Young Adults (18-25 years).
In the Netherlands, the term youth is applied to children and young people from 0 up to the age of 23 or 27, depending on the domain; e.g. preventive local youth policies up to 23 years and youth employment policies until 27 years. (Quelle: http://www.youthpolicy.nl/en/Download-NJi/Country-sheet-the-Netherlands-2016.pdf)