Constructing informative priors in the forms of mass-Z-age relations based on observational data from the MaNGA survey and simulations from TNG50. The median profiles are shown by solid black lines, which we use for priors. The dashed black lines indicate ±0.2 around the median profiles. The rightmost panel shows age-Z relation. Its median profiles are derived from combined median profiles of mass-Z and mass-age relations to illustrate how the mass-Z and mass-age priors behave on the Z-age plane.