fünfjährig
five-year-old
Having an age of five years.
Das fünfjährige Kind kommt nächstes Jahr in die Schule.
The five-year-old child will start school next year.

five-year-old / five-year
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five-year-old
Having an age of five years.
Das fünfjährige Kind kommt nächstes Jahr in die Schule.
The five-year-old child will start school next year.

This adjective is composed of the number 'fünf' (five), the noun 'Jahr' (year), and the ending '-ig'. This structure is often used to turn time expressions into adjectives.
Der fünfjährige Plan der Regierung wurde gestern vorgestellt.
The government's five-year plan was presented yesterday.
Make sure to always write the word as one word in German. The form 'fünf jährig' is incorrect. As an adjective, it is a single word.
Wir feiern das fünfjährige Bestehen unserer Firma.
We are celebrating the fifth anniversary of our company.
You can tell whether age or duration is meant from the noun. If the adjective refers to a person, it is usually about age. If it refers to a process, contract, or period of time, it is about duration.
Mein fünfjähriger Neffe liebt Dinosaurier.
My five-year-old nephew loves dinosaurs.