年龄相关问题在第二语言习得研究和我国教育政策制定上起到关键作用,有着重要的理论意义和现实意义。本论文通过初始速度和最终习得成效两个方面呈现了二语习得中的年龄效应,随后重点从三个角度对年龄问题进行了解释,分别为神经生理解释、社会心理解释和认知解释。对年龄问题的科学研究是第二语言习得能否进一步发展的关键问题之一。 Age-related issues play a key role in the study of second language acquisition and education policy in our country, which has important theoretical and practical significance. This thesis presents the age effect in second language acquisition from two aspects: initial speed and final acquisition effectiveness, and then from three angles to explain the age problem, which are neurophysiological explanation, social psychological explanation and cognitive interpretation . Scientific research on the issue of age is one of the key issues on whether or not a second language acquisition can further develop.