Ages computed with our relations versus ages from isochrone fitting (Cantat-Gaudin et al. 2020). In the left panels, we show the ages computed with the relations obtained for each radial region. The clusters are colour-coded by R_GC. In the two right panels, we show the ages computed with global relations versus the ages from Cantat-Gaudin et al. (2020). The red continuous line is the bisector and indicates the 1-to-1 relation. The yellow shaded regions indicate the clusters with ages within 2 Gyr from their age from the isochrone fitting.