While taking their usual bath, the boys discuss how much Kyotaro is like an old man. The next day, when they go to school, they find themselves exhausted by climbing up the stairs... and learn that they're all becoming old men!
That's your reasoning?
أهذا منطقُك؟
Das ist der Grund?!
¿Solo por eso?
¿Solo por eso?
– Et ça te suffit ?
– Mais oui…
Ma come ragioni?
É por isso?
Так вот почему?