Using a method developed by Durrett and Resnick [22] we establish general
criteria for the convergence of properly rescaled clock processes of random
dynamics in random environments on infinite graphs. This complements the
results of [26], [19], and [20]: put together these results provide a unified
framework for proving convergence of clock processes. As a first application we
prove that Bouchaud's asymmetric trap model on Zd exhibits a normal
aging behavior for all d≥2. Namely, we show that certain two-time
correlation functions, among which the classical probability to find the
process at the same site at two time points, converge, as the age of the
process diverges, to the distribution function of the arcsine law. As a
byproduct we prove that the fractional kinetics process ages