Normalized disk dust mass vs. normalized age for the same samples as in Fig. 5. The dust mass is normalized to the stellar mass of each object. The age is divided by the PMS lifetime of a star of the respective mass, set by the ZAMS age from the MIST PMS tracks (Dotter 2016). For the objects in Lupus (orange) and Upper Sco (green), for which no individual age is known, the age range is indicated by plotting each object as a horizontal line. The dashed lines indicate the mean values of both quantities for the different populations.