Non-Markovian modelling highlights the importance of age structure on Covid-19 epidemiological dynamicsBastien Reyné, Quentin Richard, Christian Selinger, Mircea T. Sofonea, Ramsès Djidjou-Demasse and Samuel AlizonMath. Model. Nat. Phenom., 17 (2022) 7DOI: https://doi.org/10.1051/mmnp/2022008