Dynamical age of the Stream in the model with a 9:1 mass ratio color-coded by time since the gas was stripped. For each bin in Figure 3 we compute the time since the particles were first stripped from the galaxy, with t = 0 being the present day. Average ages in each bin are shown from the SMC and LMC plotted in Magellanic Coordinates in the top and bottom panels, respectively. The SMC filament is primarily composed of gas particles stripped 2–3 Gyr ago, along with a tail of material stripped from an earlier encounter (it is uncertain whether this material would survive for such a long time in the presence of a hot halo). The LMC filament, in contrast, is composed almost entirely of recently stripped material. As in other figures, solid blue squares show the present-day centers of the LMC and SMC.