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 Sci Advisor P: 1,047 I have been thinking about this and I came to the conclusion that the fact that this coincidence arises in the Milne universe (linearly expanding universe) is natural (actually it is not a coincidence in that model). In that model t = 1/H, for every t, since $\dot a = k$ (the first time derivative of the scale factor is a constant; note that $H = \dot a / a$). I wonder now whether there is an explanation for the the similarity between the Milne universe and the concordance model today at H0 = 71 Km/s Mpc.