elfjähriges
Elfjähriges is a German adjective meaning "eleven-year-old." It is used to describe someone or something that has reached the age of eleven years or has existed for eleven years. The word is formed by combining "elf" (eleven) and "jähriges," which is a neuter form of the adjective "jährig" (yearly or annual).
In common usage, elfjähriges typically refers to the age of a person. For example, "ein elfjähriges Mädchen"
The adjective can also appear in compound words. For example, "elfjähriger Krieg" refers to an eleven-year war.