Spatial distribution of stars of a given range of age and metallicity, in FCC 153. Top: most metal-rich populations ([M/H] ≥ 0.06 dex). Bottom: most metal-poor populations ([M/H] ≤ −0.25). Left: slightly younger populations (ages ≤ 11.0 Gyr). Right: oldest populations (ages ≥ 11.5 Gyr). The color scale shows the mass density corresponding to the populations in the specific age-metallicity bin. The total mass in the age-metallicity bin is indicated on bottom-left of each map. The coverage of the two MUSE pointings is plotted in gray as well as the discarded bins. A scale bar on bottom-right of each map indicates the correspondence with physical units.