“…Although research in naturalistic settings indicates that an early start to L2 learning will convey advantages in ultimate achievement compared with a later start (e.g., DeKeyser, 2000;Johnson & Newport, 1989), research in instructed contexts has failed to identify advantages for young learners. Indeed, after the same amount of classroom input, late starters have been shown to consistently outperform early starters on practically all L2 measures employed (e.g., García Mayo, 2003;Jaekel, Schurig, Florian, & Ritter, 2017;Larson-Hall, 2008;Muñoz, 2006Muñoz, , 2008Muñoz, , 2009; see also Qureshi, 2016 for a meta-analysis). This pattern of findings is often explained with reference to young children's reliance on primarily implicit learning mechanisms, which require both extensive and intensive long-term input to be successful, and adolescents' and adults' more developed capacity to draw on explicit learning processes, which are cognitively resource-intensive, but also potentially fast and efficient and thus especially useful in the limited-input setting of a typical L2 classroom.…”