  We study numerically the aging dynamics of the two-dimensional p-state clock
model after a quench from an infinite temperature to the ferromagnetic phase or
to the Kosterlitz-Thouless phase. The system exhibits the general scaling
behavior characteristic of non-disordered coarsening systems. For quenches to
the ferromagnetic phase, the value of the dynamical exponents, suggests that
the model belongs to the Ising-type universality class. Specifically, for the
integrated response function $\chi (t,s)\simeq s^{-a_\chi}f(t/s)$, we find
$a_\chi $ consistent with the value $a_\chi =0.28$ found in the two-dimensional
Ising model.
