StarHorse Kiel diagram for the samples studied in this work. The grey dots in the background of each panel show all the stars in the respective survey, while the colour-coded histograms highlight the MSTO+SGB regime for which we deliver StarHorse ages. The dashed lines delimit the SGB, for which the computed ages are most precise. PARSEC isochrones are overplotted in red for three different metallicities, as indicated in the lower-right corner of the figure. For each metallicity, four different ages are shown: 1, 4, 7, and 10 Gyr.