HRD of the YAR stars with log g < 2.2 and −1 < [Fe/H]<  − 0.8 dex. The colour of the points is coding age (left plot) and metallicity (right plot). MIST isochrones at 2 and 12 Gyr are also plotted on the left plot in fuchsia and dark blue, respectively. In both panels, the small grey dots in background represent the thick disc reference sample (details of the selection are given in Sect. 2.2) restricted to [Fe/H]<  − 0.8.