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Originally Posted by Gem
When they say 'accelerating rate of expansion' they mean the increasing speed at which galaxies move away from each other, which is not a measure of volume.
If we hypothetically reverse the rate, then the galaxies would move closer together, slowing down rather than accelerating - just like running a film backwards - If that calculation is used, the galaxies would form a singularity in 13.7 billion years. So, the universe is 13.7 billion years old, or more precisely, the big bang occurred 13.7 billion years ago.
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This is what Edwin Hubble observed from receding Galaxies but named it ' Expanding Universe and astronomers are using its figure to determine the age of the Universe.
So astronomers should correct themselves and find the volumetric increase in space with respect to time to determine the Expansion of the Universe. Receding galaxies cannot represent whole universe.