15vuotiaiden
15vuotiaiden is the genitive plural form of the Finnish expression 15-vuotias, meaning a person who is fifteen years old. The term designates a group defined by age and is used in contexts where the attributes, rights, or actions of this group are discussed. In standard Finnish, the nominative plural is 15-vuotiaat, and the genitive plural is 15-vuotiaiden; the form without the hyphen, 15vuotiaiden, appears mainly in plain text or where diacritics and hyphens are omitted, but it is not the conventional orthography.
Usage of 15-vuotiaiden occurs in policy documents, statistics, education and youth research, and other contexts that
Grammatical note: Finnish forms with vuotias describe age. 15-vuotias is the singular form; 15-vuotiaat is the