Difference between observed and true values of Δ(age) as a function of Δ(age)_obs, color-coded according to the observed errors retrieved from PDFs. Galaxies are observed at z = 0.55 and S/N_I, obs = [10, 20, 30] (from left to right). The black horizontal dashed line corresponds to the median value of Δ(age)_obs − Δ(age)_true, while the black solid line represents the trend of observed errors at various values of Δ(age)_obs. The gray shaded area represents the region compatible with Δ(age)_obs = 0.