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We present a Bayesian implementation of isochrone fitting in deriving stellarages and masses, incorporating absolute K magnitude ($\rm M_K$) derived from2MASS photometry and Gaia DR1 parallax and differentiation between initial bulkmetallicity and present day surface metallicity, with allowance forincorporating further constraints (e.g., asteroseismology) when available. As atest, we re-computed stellar ages and masses of $\sim 4000$ stars in the solarneighbourhood from six well-studied literature samples using both Hipparcos andTGAS parallaxes. Our ages are found to be compatible with literature values butwith reduced uncertainties in general. The inclusion of parallax-based $\rmM_K$ serves as an additional constraint on the derived quantities, especiallywhen systematic errors in stellar parameters are underestimated. Wereconstructed the age-metallicity relationship in the solar neighbourhood byre-analysing the Geneva-Copenhagen Survey with the inclusion of TGAS-parallaxesand initial bulk metallicity sampling. We found a flat trend for disk starswith ages $<$11\,Gyr but with smaller scatter at all ages compared toliterature.

Stellar ages and masses in the solar neighbourhood: Bayesian analysis using spectroscopy and Gaia DR1 parallaxes