  Using the data of the ATNF pulsar catalog we study the relation connected the
real age t of young neutron stars (NS) and their spin-down age \tau. We suppose
that this relation is independent from both initial period of the NS and its
initial surface magnetic field, and that the laws of the surface magnetic field
decay are similar for all NSs in the Milky Way. We further assume that the
birth-rate of pulsars was constant during at least last 200 million years. With
these assumptions we were able to restore the history of the magnetic field
decay for the galactic NSs. We reconstruct the universal function f(t)=B(t)/B0,
where B0 is the initial magnetic field and B(t) is the magnetic field of NS at
the age t. The function f(t) can be fitted by a power law with power index
\alpha = -1.17.
