Abstract

This article addresses the effect of age in Second Language Acquisition (SLA), posing the relative question that whether the Critical Period hypothesis (CPH) exists in Second Language (SL), and if existing, how it is associated duly with SLA. The justification of comparing the achievement of L1 and L2 learners on the basis of Ultimate Attainment (UA) in the establishment of Critical Period Hypothesis, is also discussed. In the methodology, secondary data analysis was used to answer of research questions. To achieve a reliable result from the wide range of secondary data primarily from journal articles, a systemic search has been adopted. In conclusion, compare and contrast was made with earlier studies to show the findings of the study and to scope future research. 

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