person in their thirties
Eine Person, die in der Altersgruppe zwischen dreißig und vierzig Jahren liegt.
A person aged between thirty and forty.
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Viele Dreißiger suchen in dieser Stadt neue Jobs.— Many people in their thirties are looking for new jobs in this city.
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Die Zielgruppe der App sind vor allem Dreißiger.— The target group of the app is primarily people in their thirties.