AMRs for the 69 GCs with age estimates, colour-coded as in Fig. 2. The corresponding progenitors are marked in the labels. Individual age uncertainties are also plotted. In the AMR for Main Progenitor clusters (upper-left panel), diamonds represents bulge clusters while circles describe disc clusters. The two red-circled black symbols are the two clusters that satisfy the disc membership criteria but that are excluded because they are near the boundary of the respective IOM region and their location in the AMR.