Relation of [C/N] with asteroseismic age for stars at different evolutionary stages. The filled symbols are for stars with evolutionary stages determined with higher confidence. In the first plot, the solid blue relation is for the first ascent RGB stars, the red one is for RC stars, both are of the thin-disc stars. The shadowed areas show the confidence intervals of 95%. The corresponding relations from the Gaia-ESO Survey (Tautvaišienė et al. 2025) are shown for comparison by dashed lines. In the following two plots, the relations are shown for RGB and RC stars in the inner Galactic disc (R_mean < 7.5 kpc), in the Solar region (7.5 ≤ R_mean ≤ 8.5 kpc), and in the outer disc (R_mean > 8.5 kpc), respectively.