  We study the aging properties, in particular the two-time autocorrelations,
of the two-dimensional randomly diluted Ising ferromagnet below the critical
temperature via Monte-Carlo simulations. We find that the autocorrelation
function displays additive aging $C(t,t_w)=C_{st}(t)+C_{ag}(t,t_w)$, where the
stationary part $C_{st}$ decays algebraically. The aging part shows anomalous
scaling $C_{ag}(t,t_w)={\cal C}(h(t)/h(t_w))$, where $h(u)$ is a
non-homogeneous function excluding a $t/t_w$ scaling.
