Simulated white dwarf luminosity functions using the very recent metallicity law of Casagrande et al. (2011), compared to the observed luminosity functions of the SDSS (left panel) and the SSS (right panel). The adopted disk ages are 9.5 and 10.0 Gyr, respectively, which are the ages that best reproduce the position of the observed cut-off of the luminosity function. As done in previous figures, we also show the corresponding residuals.