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Friedmann equation relates Hubble constant to Universe age as 1/H0 times mass density correction factor adding a few percent. What would Hubble have observed 7 billion years ago? The same value? if so what is special about the present moment that 1/H0 fits the current age so closely? Or would the earlier Hubble have measured a bigger constant corresponding to the shorter age? If so the Friedmann equation must be wrong.