Mu / Vu = 1 / (G tu2) = ρu
In physical cosmology, the age of the universe is the time elapsed since the Big Bang.
The best measurement of the age of the universe, within the Lambda-CDM concordance model , is [3]:
13.798±0.037 billion years (13.798±0.037×109 years or 4.354±0.012×1017 seconds)
The age of the Universe can be estimated by means of other methods too.
There are at least 3 ways:
The age of the chemical elements that gives a value of [4]: