Posterior distributions resulting from the MCMC grid search. Left: corner plot for the grid search based on Π₀ and log L/L_⊙ as observables. Both the age and the mass of UBC1-106 are well constrained despite the correlation between the two parameters. The dashed lines indicate the 16th, 50th (median), and 66 percentile of the distribution. Right: posterior age distribution based on Gaia observables (log L/L_⊙, T_eff, and log g) alone (black dashed), only Π₀ (black, dotted), and Π₀ and log L/L_⊙ (solid, orange, same as top in left panel, the differences are due to a finer binning). Without the asteroseismic information, the age of UBC1-106 cannot be constrained.