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Kenneth Hyltenstam, Niclas Abrahamsson, Comments on Stefka H. Marinova-Todd, D. Bradford Marshall, and Catherine E. Snow's "Three Misconceptions about Age and L2 Learning": Age and L2 Learning: The Hazards of Matching Practical "Implications" with Theoretical "Facts", TESOL Quarterly, Vol. 35, No. 1 (Spring, 2001), pp. 151-170
Hyltenstam et al. (Mon,) studied this question.