elfjährigem

Elfjährigem is the dative singular form of the German adjective elfjährig, meaning “eleven-year-old.” The adjective is formed from elf (eleven) and jahrig (year-old) and is used to describe a noun with the quality of being eleven years old. Like other German adjectives, elfjährig is declined to agree with the noun it modifies.

Elfjährigem is the form used in the strong (undetermined) declension for masculine or neuter nouns in the dative singular, for example in phrases like mit elfjährigem Alter. The corresponding forms for other cases and genders include elfjähriger (masculine nominative), elfjähriges (neuter nominative/accusative), and elfjährige (feminine nominative or plural). When a definite article or determiner is present, the endings change (for example, das elfjährige Kind, dem elfjährigen Jungen).

Usage notes: Elfjährig is common in written German to describe age in a formal or descriptive way. In everyday speech, people more often say elf Jahre alt rather than using the adjective form, though elfjährig appears in literature or formal writing.