Comparison of the recent [C/N] versus age relations for the 1DUP RGB stars. The blue line and the shadowed confidence interval of 95% show the relation computed in our work, the thick dashed line is from the Gaia-ESO survey open clusters (Tautvaišienė et al. 2025), the orange lines are from Spoo et al. (2025) for the polynomial and linear fits based on open and globular clusters, and the green lines are from Roberts et al. (2025) for the field stars of two different metallicities.