“…Previous research in Europe and the United States has mostly focused on the impact of ART on overall fertility by adopting either a period (Habbema et al, 2009;Hoorens et al, 2007;Tierney, 2022) or cohort (Leridon, 2017;Leridon & Slama, 2008;Sobotka et al, 2008) approach, with most studies showing a rather modest contribution of 2-5%. Studies that have looked at age-specific ART fertility have found that the absolute contribution of ART to the TFR often peaks in the mid-30s, while the relative share of ART births increases with age (Burcin et al, 2020;Lazzari et al, 2021;Tierney, 2022). For example, Lazzari et al, (2021) found that increases in period fertility rates at late (40 +) reproductive ages in Australia were largely driven by the increasing use of ART.…”