
vierzig
forty
The cardinal number that comes between thirty-nine and forty-one; the number 40.
Sie hat zu ihrem vierzigsten Geburtstag eine große Party gefeiert.
She celebrated her fortieth birthday with a big party.
forty
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forty
The cardinal number that comes between thirty-nine and forty-one; the number 40.
Sie hat zu ihrem vierzigsten Geburtstag eine große Party gefeiert.
She celebrated her fortieth birthday with a big party.
The number 'vierzig' (forty) follows a clear pattern. It consists of the base number 'vier' (four) and the ending '-zig', which is used for the tens from 20 onward.
Das Buch hat etwas mehr als vierzig Seiten.
The book has a little more than forty pages.
To give an approximate age, you often use the expressions 'Anfang vierzig' (early forties), 'Mitte vierzig' (mid-forties), or 'Ende vierzig' (late forties). The phrase 'in den Vierzigern sein' means that a person is between 40 and 49 years old.
Meine neuen Nachbarn sind beide Mitte vierzig.
My new neighbors are both in their mid-forties.
Although 'vierzig' (forty) is a number, it can also be used as a noun to refer to the age or the number itself. In this case, the word is capitalized and declined.
Er nähert sich mit großen Schritten der Vierzig.
He is quickly approaching forty.
fourteen
Vierzehn and vierzig both begin with vier, but they refer to different numbers. Here, the ending -zehn indicates 14, while -zig forms the full multiple of ten 40. You should therefore pay particular attention to the ending when listening.

Für den Kurs haben sich vierzig Personen angemeldet.
Forty people signed up for the course.
Für den Kurs haben sich vierzehn Personen angemeldet.
Fourteen people signed up for the course.