Age estimate for the spheroidal bulge of the MW using the AMR for the in situ (red line) GCs. The GCs are compiled from Kruijssen et al. (2019); Souza et al. (2024a); Ortolani et al. (2025). For details on the method and the AMR fitted parameters, see Ortolani et al. (2025). On the right, the MDFs for the spheroidal bulge (grey) and the halo-like stars (blue) from Fig. 21 are shown. The thick grey curve along the in situ AMR line corresponds to the central peak of the spheroidal bulge MDF and provides an estimate for the age. We note that, given the long tail of the spheroidal bulge, it also includes the bona fide metalpoor GCs, as shown in Souza et al. (2024a).