By fitting redshift distance data we can estimate the present Hubble rate H(adsbygoogle = window.adsbygoogle || []).push({}); _{0}and the longterm limit that the Hubble rate is tending towards H_{∞}.

The Age (how long the universe has been expanding) can be calculated just from those two measurements, assuming the spatial-flat standard cosmic model---essentially the Friedmann equation.

Basically you take the ratio H_{0}/H_{∞}= 1.201

and solve $$x = \frac{1}{3}\ln(\frac{1.201+1}{1.201-1})$$

Then x/H_{∞}is the Age in whatever units you like to use.

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# How to calculate the Age of the Universe, from observations

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