  We provide a direct experimental test of the Stokes-Einstein relation as a
special case of the fluctuation-dissipation theorem (FDT) in an aging colloidal
glass. The use of combined active and passive microrheology allows us to
independently measure both the correlation and response functions in this
non-equilibrium situation. Contrary to previous reports, we find no deviations
from the FDT over several decades in frequency (1 Hz-10 kHz) and for all aging
times. In addition, we find two distinct viscoelastic contributions in the
aging glass, including a nearly elastic response at low frequencies that grows
during aging. This is the clearest change in material properties of the system
with aging.
