  Age consistency for the Universe today has been an important cosmological
test. Even more powerful consistency tests at times as early as 10^{-32} sec
lie ahead in the precision era of cosmology. I outline tests based upon cosmic
microwave background (CMB) anisotropy, big-bang nucleosynthesis (BBN), particle
dark matter, phase transitions, and inflation. The ultimate cosmic timescale --
the fate of the Universe -- will be in doubt until the mystery of the dark
energy is unraveled.
