Age and accent
①It is generally speaking only children who start to learn a new language early that aquire pronunciation
that doesn't immediately differ from a nativespeaker's use of the language.
②A possibly sensitive period for the acquisition of pronunciation begins then around 5-6.
③According to a great deal of the research carried out within pronunciation,it is impossible after the age of 15-16 to achieve a near-native pronunciation in the new language,no matter how motivated one is and no
matter how favorable one's access is to hearing and using the language.
これは大変なことを言っています。敏感期の扉は小学校１年生より閉まり始まり、中学校３年生には完全に閉まってしまうと。ということは発音は｢小学校のうちが勝負」ということです。