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die älteste

the oldest

→ der
phrase Rare #42,377
the oldest Feminine form of the superlative adjective alt (old). It is used before a feminine noun or on its own when the feminine noun is understood; for example, die älteste Tochter means “the eldest daughter.”
GE: Sie ist die älteste in unserer Familie.
EN: She is the oldest in our family.

Tom war die älteste Person im Raum.

Tom was the oldest person in the room.

Fatima ist die älteste Studentin in unserer Klasse.

Fatima is the oldest student in our class.

Ah ja, das ist die älteste Larkins-Tochter.

Oh yes, that's the eldest Larkin daughter.

— David Copperfield - Einmal Reichtum und zurück (2019)

Tante Jacqueline, die älteste Freundin meiner Eltern.

Aunt Jacqueline, my parents' oldest friend.

— Crazy Rich (2018)