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After a recent conversation, I was trying to determine if there is an online authoritative definition for the age of the universe. The Wiki article states "the International Astronomical Union presently use 'age of the universe' to mean the duration of the Lambda-CDM expansion", but the reference is to a popular press article which does not state anything of the sort and a search of the IAU home page did not come up with anything similar.
Does anyone have such an online authoritative reference for the definition of the age of the universe?
Does anyone have such an online authoritative reference for the definition of the age of the universe?