How can the universe be 13.7bln years old if time depends on your frame of reference? Could others “think” it’s older or younger?

Question

How can the universe be 13.7bln years old if time depends on your frame of reference? Could others “think” it’s older or younger?

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Answer 1

You are right. The 13.7bln years number is in the frame of reference where the cosmic microwave background appears isotopic (same in every direction).