student asking question

Is "at" necessary in "how and at what"? I don't understand why "at" is being used in that phrase.

teacher

Native speaker’s answer

Rebecca

Yes, "at what" is grammatically correct here. It has been used to mean "when (age)," and can also be substituted with "when" here without changing the meaning of the sentence. Ex: Who and where are we meeting? Ex: How and at what age we die depends on a number of factors.

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