student asking question

What does "by the time" mean?

teacher

Native speaker’s answer

Rebecca

"By the time" is an idiom used to mean when or at the time. So he is saying he will be a senator when he is 30. Ex: I was able to swim by the time I was 10. Ex: By the time I went to school, I could already read. Ex: He'd already finished eating by the time I arrived.

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