Given the massive spectroscopic surveys and the Gaia mission, the Milky Way has turned into a unique laboratory to be explored using abundance ratios that show a strong dependency with time. Within this framework, the data provided through asteroseismology serve as a valuable complement. Yet, it has been demonstrated that chemical traits can not be used as universal relations across the Galaxy. The aim of this work is to investigate the dependence on metallicity of the chemical ratios employed for inferring stellar ages. We aim to explore different combinations of neutron-capture, odd-Z and alpha elements as a function of age, particularly focusing on their metallicity dependence for a sample of 74 giant field stars. Using UVES observations, we derive atmospheric parameters and high-precision line-by-line chemical abundances (<0.04dex) for the entire set of spectra, which covers a wide spread in age (up to 14Gyr) and metallicity (-0.7<[Fe/H]<+0.1). Stellar ages are inferred from astereoseismic information. By fitting chemical-age trends for three different metallicity groups, we estimated their dependence on metallicity. Simultaneously, we identified those exhibiting stronger correlations with time. We found that the stronger chemical-age relations ([Zr/alpha]) Are not necessarily the ratios with the smaller dependence on metallicity ([Ce/alpha] and [Ce/Eu]). We confirm the [n-capture/alpha]-age trends for evolved stars, wherein the most significant correlation is evident in stars with solar-metallicity, gradually diminishing in stars with lower iron content. The lack of homogeneity within the metallicity range highlights the intricate nature of our Galaxy's star formation history and yield production. The dependence on metallicity of the yields involving s-process elements and the influence of radial stellar migration pose challenges to relying solely on chemical abundances for dating stars. These findings contest the feasibility of establishing universally applicable chemical clocks valid across the entire Galaxy and across various metallicity ranges.

Cone search capability for table J/A+A/687/A164/abund (Results of the spectroscopic analysis for each star stellar parameters, mean abundances and the corresponding uncertainties)