
Back in the days
Nostalgic Tone
The phrase often implies a fond reminiscence of the past.

Back in the days, we would spend all summer outdoors.
Not Precise
The time period referred to is not specific and can vary greatly.

Back in the days, people wrote letters instead of emails.
Colloquial Usage
It's casual language, used more in spoken than in written English.

We used to go to the arcade back in the days.
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