Irani M, et al. - In this retrospective cohort study, researchers examined the influence of maternal age at retrieval on the implantation potential of euploid blastocysts. They analyzed patients who underwent frozen-thawed euploid embryo transfers (FET) between 2013 and 2016 at an academic medical center. Observations revealed that the number of euploid embryos but not their implantation potential is influenced by maternal age at retrieval. For selecting among euploid embryos, they identified the morphodynamic characteristics of embryos, as reflected by blastocyst morphology and speed of development, as critical.