Age of universe

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Hubble's law is the name for the observation in physical cosmology that: (1) objects observed in deep space are found to have a Doppler shift interpretable as relative velocity away from the Earth; and (2) that this Doppler-shift-measured velocity, of various galaxies receding from the Earth, is approximately proportional to their distance from the Earth. Following equation shows Hubble's law. Then what is the age of universe according to Hubble''s law? \[\begin{align} v &= Hr \text{, where} \\ v &: \text{ velocity away from the Earth} \\ H & \text{ Hubble constant, and} \\ r &= \text{ distance from the Earth.} \end{align} \]

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