No. 16,959 in Russian
сорокалетним
"Сорокалетним" means "forty-year-old" in English.
In a sentence
Мой отец стал сорокалетним в прошлом году.
My father turned forty years old last year.
In this sentence, "сорокалетним" is used as an adjective describing "мой отец" with the instrumental case, denoting his age of forty.
Они разговаривали с сорокалетним мужчиной о строительстве.
They talked to a forty-year-old man about construction.
Here, "сорокалетним" is an adjective modifying "мужчиной" in the instrumental case, specifying the age of the man they talked to.
Мы заметили сорокалетним изменения в его поведении.
We noticed changes in his behavior at forty years old.
In this example, "сорокалетним" functions to describe the time or age when changes were noticed through the instrumental case.
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