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This study investigates the role of age of acquisition (AoA) on the bilingual mental lexicon. Four groups of participants were tested: (i) English native speakers with minimal exposure to French; (ii) late English-French bilinguals; (iii) early English-French bilinguals; and (iv) simultaneous English-French bilinguals. We used a masked priming paradigm to investigate early, automatic lexical processing at the semantic level by testing both a within-language semantic condition and a cross-language translation condition. AoA was investigated both through group effects and a correlation analysis. We found significant translation priming effects for the simultaneous and early bilinguals only, and a significant correlation between AoA and translation priming effects. Due to the matched L2 proficiency of the early and late bilinguals, these results support our hypothesis that an early AoA, regardless of L2 proficiency, is crucial in order to find the L2-to-L1 priming effects that have often been elusive in recent studies.
