Language education curricula and programs worldwide have begun emphasizing foreign language instruction for learners as young as 5-6 years, particularly in English. Yet, while studies have argued for the benefits of early language instruction, the results of this trend in terms of actual achievement are not clear. For this reason, the researchers designed this study to illustrate the connection between age of onset of English as a foreign language (EFL) instruction and learner achievement, examining international language curricula from countries where English is taught as a foreign language beginning at the pre-primary and primary level alongside the corresponding scores on the Test of English as a Foreign Language (TOEFL). The findings indicate that, although early onset of EFL instruction may be beneficial in many respects, it is not, in itself, a guarantee of success, and other elements, such as class size, number of hours dedicated to English instruction, and teacher qualifications, must also be considered.