The Hubble Constant and the Age of the
Universe
If you plot the scale of the Universe vs
time, the Hubble constant is the slope of the line now. If it’s really
constant, then the age of the Universe is just 1/H [since
H=v/D=(d/t)/d].
That’s because if you know how fast we are
expanding, you can run the movie backwards and see when everything crunches
together.
If
the Universe is slowing its expansion, you get a younger age.
You can compare the age gotten this way with the
oldest globular cluster, or other independent methods. Recently they have all come into
agreement.