I believe language learning like most anything varies quite a bit individual to individual. Much of it might come down to interest. I am horrible with language. When graduating college a friend and I exchanged transcripts and his comment was. Wow. Actually you get pretty good grades (im looking at him like did you expect me to do poorly?), oh, except in spanish. When english was a subject in school it was my worst subject. Now my brother on the other hand totally geeks out on spanish and latin culture. He says he does not speak that well but in the right scenario (low light setting) it can take awhile for someone to realize he is white. I think they realize there is something wierd about his accent but figure he is from somewhere they are not or was diluted by being in the us or such.