Comparison of ages (panels a, b, and c) and metallicities (panels d, e, and f) of quiescent galaxies from several previous studies and our results from ALHAMBRA at redshift range 0 <  z <  1.2. From left to right, the median mass-weighted ages and metallicities retrieved using MUFFIT (solid lines) and BC03 (panels a and d), EMILES with BaSTI (panels b and e), and Padova00 isochrones (panels c and f), respectively. The ages and metallicities retrieved from other work are colour-coded in concordance with their proximity to the stellar mass bins of our quiescent sample (see inset). Dashed orange lines illustrate the average age and metallicity in galaxy clusters obtained by Jørgensen et al. (2017). The grey region limits the Universe age.