love story

I think the school system runs different in Japan

I think he's fifteen or fourteen

Well I checked it and he was 11 to 12 years old when he confessed!!
https://en.wikipedia.org/wiki/Education_in_Japan

分别是23岁，20岁，17岁和14岁。

六岁上小学一年级，可以根据他的年级推测他的年龄。