Correlation between the age of the youngest GC peak in their age distribution (t_{last GC peak}) and the formation time of the MW-mass simulated galaxies (t_form), colored by the virial mass at z = 0. The youngest peak is required to have an absolute value above 10. The formation time of a galaxy is taken as the lookback time at which the galaxy has reached half of its virial mass at z = 0. The MW-analog and non-MW-analog from Fig. 2 are additionally circled in orange and red, respectively.