Since time = R / V = d/v = 1 / H0,
  t = 106 pc/72 km/s = 106 x 3.08 x 1013/ 72
     = 4.3 x 1017 sec 
     = 14 x 109 yr          
Hubble constant ® Expansion age of universe !!
Hubble Law ®v = H0 d
where v = recessional velocity
          d = distance to galaxy
         H0 = Hubble constant
              = slope of line
        H0 = 72 km/s/Mpc (± 10%)
i.e. if distance to galaxy increases by 106 pc, galaxy’s
recessional speed increases by 72 km/s