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We use linear rheology and multispeckle dynamic light scattering (MDLS) toinvestigate the aging of a gel composed of multilamellar vesicles. Lightscattering data indicate rearrangement of the gel through an unusual ultraslowballistic motion. A dramatic slowdown of the dynamics with sample age $t_{w}$is observed for both rheology and MDLS, the characteristic relaxation timescaling as $t_{w}^{\mu}$. We find the same aging exponent $\mu =0.78$ for bothtechniques, suggesting that they probe similar physical processes, that is therelaxation of applied or internal stresses for rheology or MDLS, respectively.A simple phenomenological model is developed to account for the observeddynamics.Comment: 8 pages, 4 figures, Submitted to PR

Ultraslow Dynamics and Stress Relaxation in the Aging of a Soft Glassy System