Radial age profile derived by Carollo et al. (2016) for the blue horizontal branch population of the stellar halo (black solid line). The red line shows the same profile once corrected for the red giant branch mass loss used in this paper. The shaded areas show the profile extrapolations assuming either a flattening or a steady gradient. The blue dot marks the age obtained for the bulge RR Lyrae population. The arrow marks the age of the Universe, according to the cosmological parameters of Planck Collaboration VI (2020).