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By fitting redshift distance data we can estimate the present Hubble rate H0 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 H0/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.
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 H0/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.