Example of age determination improvement by using dynamical stellar mass priors, using J16395577-2347355 as an example. On the left, we show the HR diagram best-fit posteriors of age (top panel) and mass (right panel). On the right, we show the distributions obtained after including a gaussian prior on the stellar mass built on the dynamical measure presented in Zallio et al. (2026). The red dot represents the peak of both the mass and age likelihoods.