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 .