  We present results for the aging dynamics of a jammed 2D colloidal system
obtained with molecular dynamics simulations. We performed extensive
simulations to gather detailed statistics about rare rearrangement events. With
a simple criterion for identifying irreversible events based on Voronoi
tessellations, we find that the rate of those events decelerates
hyperbolically. We track the probability density function for particle
displacements, the van-Hove function, with sufficient statistics as to reveal
its two-time dependence that is indicative of aging. Those displacements,
measured from a waiting time $t_{w}$ after the quench up to times
$t=t_{w}+\Delta t$, exhibit a data collapse as a function of $\Delta t/t_{w}$.
These findings can be explained comprehensively as manifestations of "record
dynamics", i.e., a relaxation dynamic driven by record-breaking fluctuations.
We show that an on-lattice model of a colloid that was built on record dynamics
indeed reproduces the experimental results in great detail.
