  We classify the future of the universe for general cosmological models
including matter and dark energy. If the equation of state of dark energy is
less then -1, the age of the universe becomes finite. We compute the rest of
the age of the universe for such universe models. The behaviour of the future
growth of matter density perturbation is also studied. We find that the
collapse of spherical overdensity region is greatly changed if the equation of
state of dark energy is less than -1.
