
Okay, so I hyperfixated in this topic and i had to go do research and now im even more confused, cuz like he said he went and did his junior high in france, but junior high would be at least three years, so its kind of impossible they havent seen each other for only two year, UNLESS, unless he did his two last years of junior high on france and his first year pf junior high in japan.
I dont think they are in junior high because he talks about doing it in past tense, so...
That would make them... fifteen? Sixteen if u assume theyre not in junior high anymore and on their first year of senior high.
... im thinking too much about this.
So either Im a genious or the author didnt bother to double check the timeline.

In Japan, grades go 1 to 6, year 6 being about 12 years old. Then 1 to 3 (or 7 to 9), then 1 to 3 (10 to 12). First year high schoolers are about 15 to 16 depending on the time of year and date of birth.
In CHAPTER 1 the black haired one/red haired one idk says it's been five years. I think it's page 29 ish. And 4th grade is 9 to 10 years old. A play probably would have taken place at the end of the school year, so they are probably 10. Seeing as both of them are transfer students it's probably not Spring at the beginning of the story. And I'm not sure what france's school system is like, but if they have similar years to america we can probably conclude that Blondie/blue haired boy moved back to japan in the summer, yeah? Putting both of them in the second half of the year. Meaning they are probably closer to 16 than to 15.
And also, despite how much I don't like it, 15 is the average age at which people start doing the nasty so
The scene at the end with the two years bit takes place after black/red haired guy moves away from the city, hence why he can see the stars better than he can from his current home. The implication in this scene is that even 3 years after the event he's still hung up on Blondie. His father also explicitly states he's in junior high and should be sneaking out, which presents a significant passage of time.
I made an account after 6 years of silence on this site because I don't understand why so many people are confused about their ages.
Okay but why is no one talking about how they are only 12 years old?