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!
My, they've aged even more 
than I was expecting.
يا للهول! كبِروا حتّى أكثر ممّا توقّعت
Aha. Die sind ja noch älter als erwartet.
Vaya, envejecen más de lo que pensé.
Vaya, envejecen más de lo que pensé.
Oh oh, stanno invecchiando
più di quanto mi aspettassi.
Nossa, eles envelheceram ainda
mais do que eu esperava.
Ого, да они постарели
куда сильнее, чем я ожидал.