If the density of the universe is equal to the critical density, and H equals 50 km/s/Mpc, then the true age of the universe is 13.3 billion years.

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This statement is known as the "Hubble Time" and assumes that the universe is flat and composed of normal matter and dark energy in the same proportions as observed today. With these assumptions, a Hubble constant of 50 km/s/Mpc yields an age of 13.3 billion years, given that the density of the universe is equal to the critical density needed to prevent it from collapsing under its own gravity. However, recent observations suggest that the universe may have a slightly different composition and geometry, which could affect its age calculations.

If the Density of the Universe Is Equal to the Critical