The merger history of a galaxy has a direct impact on the structure of its thick disc. Among other effects, mergers induce flaring in the stellar populations in the disc, which can be reflected on the thick disc’s age structure. As we are studying the age structure of thick discs in the MW and nearby galaxies with an unprecedented level of detail, it is important to use simulations in order to have a more comprehensible picture of the diversity of thick disc age structures, and their connection to the merger history of galaxies. In this talk, we present the results of an analysis performed on a sample of 27 simulated disc galaxies in their cosmological context. We explain how the flaring of the thick disc's stellar populations induces disc flaring, creates features like age radial gradients along the disc, and continuous/bimodal thin/thick disc structures. We also point to connections between these features and the merger history of the galaxies.

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