Final sample of open cluster stars. Left: galactic location of the open clusters, where the dark-green dotted circle and solid circle denote the solar radius and the galactic centre, respectively. The inset shows a closer view of the clusters in the solar neighbourhood. Right: open cluster ages (top), height above the Galactic plane (middle), and metallicity [Fe/H] (bottom), each against galactocentric radius. The colour map of [Fe/H] is the same for all four plots.}