  Perturbations in Prigogine's cosmological model with particle creation are
investigated in the framework of Newtonian Theory.
  The necessary conditions for the density contrast to reach the non-linear
regime wich is necessary to garantee structure formation at large scale are
obtained.
  The upper limit of the age of the universe is investigated for the
perturbations obtained to find them compatible with the observed data from
COBE(Cosmic Background Explorer satellite).
