Primordial (blue) and enriched (red) field stars in the Kepler sample, with the sample of GC stars identified by Schiavon et al. (2024) (green), both using APOGEE DR17 abundances. Stars in the Kepler sample with ages determined through asteroseismology are shown with black borders. Upper left panel: [N/Fe] vs. [C/Fe] anti-correlation. Lower left panel: [N/Fe] vs. [O/Fe] anti-correlation. Upper middle panel: Toomre diagram. Lower middle panel: integral of the motion plot. Upper right panel: histogram of the ages estimated from asteroseismology against GC ages from Forbes & Bridges (2010) (grey histogram). Lower right: histogram of the masses derived from asteroseismology.