“…Some support for this hypothesis exists, as age of acquisition is a good predictor of L2 consonant and vowel perception (Flege, 2007) such that early (childhood) bilinguals are more accurate than late (adolescent and adult) bilinguals. Furthermore, subtle differences in L1 (e.g., Flege 1987; Kang & Guion, 2006) and L2 speech perception and production (e.g., Lev‐Ari, van Heugten, & Peperkamp, 2017; Mayo, Florentine, & Buus, 1997; Sebastián-Gallés, Echeverría, & Bosch, 2005) have been observed between early and late bilinguals. For example, Sebastián-Gallés and collegues (2005) tested both sequential Catalan-Spanish and Spanish-Catalan bilinguals as well as simultaneous bilinguals of the same two languages.…”