“…Regarding the birth cohort covariate, it showed no significant effect based on our French data, as opposed to what was found in the Italian dataset. In addition to the fact that French birth cohorts are generally older than that of Italy (1883Italy ( -1901Italy ( vs. 1896Italy ( -1910, the lack of a cohort effect in our analysis might also come from the absence of clear mortality reductions after ages 90 to 92 in the French population (Meslé and Vallin 2020). It is therefore probably still too early to observe any mortality improvement among semi-and supercentenarians in our birth cohorts, hence the lack of a cohort effect.…”