Age distribution of the mean light fraction Σx_j population vector (left column) and mean mass fraction Σμ_j population vector (right column) for GRGs, FRIIs, neighbours of GRGs and neighbours of FRIIs. Top panels: we compare stellar populations of the GRG’s hosts with their neighbouring galaxies, in the middle panels – the hosts of smaller-sized FRII radio galaxies with their neighbouring galaxies, next – comparison between giants and smaller-sized FRIIs, and in the bottom panels – between neighbours of giants and neighbours of FRIIs in a radius of 0.5 Mpc from radio galaxy host.