Age–metallicity relation in the Galactic disk

Is there a universal age–metallicity relation (AMR) in the Galactic disk (both "thin" and "thick" parts of the disk)? In the local (primarily thin) disk of the Milky Way, there appears to be no evidence of a strong AMR. A sample of 229 nearby "thick" disk stars has been used to investigate the existence of an age–metallicity relation in the Galactic thick disk and indicates that there is an age–metallicity relation present in the thick disk. Stellar ages from asteroseismology confirm the lack of any strong age–metallicity relation in the Galactic disc.

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Source: List of unsolved problems in astronomy (CC BY-SA 4.0)