\frac{\frac{km}{s}}{Mpc} = \frac{km}{Mpc ∗ s}

H_{0} = 500 \frac{km}{Mpc ∗ s} (\frac{1000 m}{1 km}) (\frac{1 Mpc}{3.1 × 10^{22} m})

age of the universe ∼ \frac{1}{H_{0}}