对外语学习年龄问题的讨论是二语习得领域的热点问题之一.年龄差异的研究主要集中在语言学习是否存在关键期的问题讨论上.文章通过介绍语言习得的关键期假说、非关键期假说和敏感期假说,在此基础上比较了不同年龄段的外语学习者各自的优势和不足,并提出了其对我国的日语教学的启发. The discussion of the age of foreign language learning is one of the hot topics in the field of second language acquisition.The study of the age difference mainly focuses on the discussion of whether there is a critical period in language learning.Through introducing the key period hypothesis of language acquisition, Period hypothesis and sensitive period hypothesis. On the basis of this, we compared the respective advantages and disadvantages of foreign language learners of different ages and put forward their enlightenment on Japanese teaching in our country.