Mass–metallicity and star formation rate in galaxies: A complex relation tuned to stellar ageS. Duarte Puertas, J. M. Vilchez, J. Iglesias-Páramo, M. Mollá, E. Pérez-Montero, C. Kehrig, L. S. Pilyugin and I. A. ZinchenkoA&A, 666 (2022) A186DOI: https://doi.org/10.1051/0004-6361/202141571