Age of the universe - Wikipedia
https://en.wikipedia.org/wiki/Age_of_the_universe
OverviewHistoryExplanationObservational limitsCosmological parametersWMAPPlanckAssumption of strong priorsIn 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
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