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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>How can the universe be 13.7bln years old if time depends on your frame of reference?
we are not using our time reference, we are using speed of light to measure the expansion, using the factor of the constant speed of it.
It can not be younger nor older. Just the measurements can vary depending on the scale.
For example:
If a coffee costs $1 in USA, and 200$ in Portugal (using our old currency) is it more expensive in Portugal? No, because 200PT are still same as 1 Dollar. More or less.
>In physical cosmology, the age of the universe is the time elapsed since the Big Bang. Astronomers have derived two different measurements of the age of the universe: a measurement based on direct observations of an early state of the universe, which indicate an age of 13.787±0.020 billion years as interpreted with the Lambda-CDM concordance model as of 2021; and a measurement based on the observations of the local, modern universe, which suggest a younger age. The uncertainty of the first kind of measurement has been narrowed down to 20 million years, based on a number of studies that all show similar figures for the age. These studies include researches of the microwave background radiation by the Planck spacecraft, the Wilkinson Microwave Anisotropy Probe and other space probes. Measurements of the cosmic background radiation give the cooling time of the universe since the Big Bang, and measurements of the expansion rate of the universe can be used to calculate its approximate age by extrapolating backwards in time. The range of the estimate is also within the range of the estimate for the oldest observed star in the universe.
We did several studies on stars distance, movements and etc and all studies point to similar results basically
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