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

Time is not dependent on how old or young any human thinks the universe is. It’s a measurable, observable phenomenon and is required for the second law of thermodynamics to be true.