  We employ Monte Carlo simulations to investigate the non-equilibrium
relaxation properties of the two- and three-dimensional Coulomb glass with
different long-range repulsive interactions. Specifically, we explore the aging
scaling laws in the two-time density autocorrelation function. We find that in
the time window and parameter range accessible to us, the scaling exponents are
not universal, depending on the filling fraction and temperature: As either the
temperature decreases or the filling fraction deviates more from half-filling,
the exponents reflect markedly slower relaxation kinetics. In comparison with a
repulsive Coulomb potential, appropriate for impurity states in strongly
disordered semiconductors, we observe that for logarithmic interactions, the
soft pseudo-gap in the density of states is considerably broader, and the
dependence of the scaling exponents on external parameters is much weaker. The
latter situation is relevant for flux creep in the disorder-dominated Bose
glass phase of type-II superconductors subject to columnar pinning centers.
