Median distribution of stellar ages, [Fe/H] abundance, and [O/Fe] abundance for the sample of galaxies. Top: fraction of stars of a given age for all stars in the galaxy and stars identified as in situ and ex situ, as indicated in the legend. Each panel shows the distribution that corresponds to a given component (halo, bulge, cold disc, and warm disc), normalised to the total amount of stars in that component. Middle: same as the top row, but for the [Fe/H] abundance. Bottom: same as the top row, but for the [O/Fe] abundance.