Time & Universe: Relative Meaning & Age

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The discussion centers on the implications of relativity in understanding the age of the universe, which is commonly stated as 13.75 billion years. It explores how time measurements can vary based on the observer's frame of reference, particularly in relation to the Cosmic Microwave Background (CMB). One participant estimates that a clock at rest with respect to the CMB would measure time slightly faster, suggesting a difference of about 10 years. The conversation also questions whether there is an "absolute" frame of reference in the universe, concluding that while there is no absolute space-time, there exists a specific frame related to the CMB. The complexities of measuring time and age in a relativistic context are highlighted throughout the discussion.
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If time is relative then what does it mean when they say the universe is 13.75 billion year old?
 
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I believe the universe is 13.7 billion years old as per a clock on Earth. A clock at rest with respect to the CMB and away from any major gravitational sources would be SLIGHTLY faster. About 10 years faster by my estimate.
 
ubcstudent said:
If time is relative then what does it mean when they say the universe is 13.75 billion year old?

Same as when we say "my car is 10 years old".
 
Drakkith, are you suggesting, that there is absolute space-time FOR? More or less equal to CMB?
(1 - sqrt(1 - (370/300000)^2)))*13.7*10^9
10419 years according to me.
 
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An absolute frame? No. But there is a frame that is at rest with respect to the CMB.
 

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