Luminosity-weighted age (left panels) and luminosity-weighted stellar metallicity (right panels) versus stellar mass for LEGA-C galaxies. The upper panels show individual measurements. The silver sample is shown with silver circles and golden galaxies are highlighted with golden circles. Middle panels show the median age (panel c) and median stellar metallicity (d) in bins of stellar mass 0.2 dex wide and with at least five galaxies. Thick vertical error bars show the error on the median, while thin horizontal and vertical bars indicate the 16th–84th interpercentile range of the distribution. Silver filled squares refer to the silver sample weighted for completeness with Tcor × w_spec_silver, while golden filled (empty) squares refer to the golden sample without (with) weights. The corresponding lines in panel c (d) display the relation as in Eq. (1) that best fits the median values of age (metallicity) for the weighted silver and weighted golden sample respectively. The bottom panels compare the mean error on individual age and stellar metallicity estimates (crosses) with the dispersion, as given by the 16th–84th interpercentile range, at fixed stellar mass (hexagons), with silver (golden) symbols for silver (golden) sample.