  The aging effects of a 'diffusing glass', a single elastic string diffusing
in a two-dimensional disordered media assisted by thermal noise are studied by
Monte Carlo (MC) simulations. We find for the first time convincing numerical
evidence of non-trivial aging effects both in the linear response against
transverse force and the associated correlation function. Our results retain
some important predictions of the conventional dynamical mean-field theory
(MFT) but also reveal remarkable differences from it.
