Japanese have to study English at an early age

Firstly, a child can learn to listen to and speak in English naturally. English has peculiar pronunciation, which Japanese does not have. A child can listen and speak English with the correct prununciation, and use native English.
Secondly, a child thought fun about English. For example, singing English songs, dancing with English songs, and English games and so on. According to eigo de asobo PLANET online, The first step of English communication is a great success when a child begins to think "English is fun!"
Finally, a child can become used to speak and listen to English. If a child study English at an early age, a child can nuturally study English.
So, Japanese have to study English at an early age.