
vierjährig
four-year-old
Having an age of four years.
Das vierjährige Kind konnte schon seinen Namen schreiben.
The four-year-old child could already write his name.
four-year-old / four-year
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four-year-old
Having an age of four years.
Das vierjährige Kind konnte schon seinen Namen schreiben.
The four-year-old child could already write his name.

four-year
Having a duration of four years.
Nach einer vierjährigen Amtszeit wurde der Präsident wiedergewählt.
After a four-year term in office, the president was reelected.
Adjectives like 'vierjährig' (four-year-old/four-year) are formed from a number and a unit of time (here: year) with the ending '-ig'. This pattern is very productive, for example also in 'zweitägig' (lasting two days) or 'einstündig' (lasting one hour).
Wir machen eine dreitägige Wanderung in den Alpen.
We are going on a three-day hike in the Alps.
You distinguish the meanings by the noun: if 'vierjährig' refers to a living being (child, animal), it is about age. If it refers to a thing (contract, training program, term of office), it is about duration.
Unser vierjähriger Sohn kommt bald in den Kindergarten.
Our four-year-old son will soon start kindergarten.
To state the age of a person or animal, 'vierjährig' (four-year-old) is used only before a noun. When the adjective stands alone after the verb, you use the construction 'vier Jahre alt' (four years old).
Ein vierjähriges Pferd ist noch sehr jung.
A four-year-old horse is still very young.
In the meaning 'lasting four years', the adjective is often combined with nouns such as 'Amtszeit' (term of office), 'Ausbildung' (training program), 'Studium' (degree program/studies), 'Plan' (plan), or 'Vertrag' (contract).
Nach dem vierjährigen Studium suchte er sofort einen Job.
After the four-year degree program, he immediately looked for a job.