  We use linear rheology and multispeckle dynamic light scattering (MDLS) to
investigate the aging of a gel composed of multilamellar vesicles. Light
scattering data indicate rearrangement of the gel through an unusual ultraslow
ballistic motion. A dramatic slowdown of the dynamics with sample age $t_{w}$
is observed for both rheology and MDLS, the characteristic relaxation time
scaling as $t_{w}^{\mu}$. We find the same aging exponent $\mu =0.78$ for both
techniques, suggesting that they probe similar physical processes, that is the
relaxation of applied or internal stresses for rheology or MDLS, respectively.
A simple phenomenological model is developed to account for the observed
dynamics.
