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!
However, the bathwater itself is all the 
hotter for having no one in it yet.
لكن، ماء الحمّام بحدّ ذاته يكون أسخن
لعدم دخول أحد إليه بعد
Aber andererseits ist das Wasser extra heiß,
weil noch niemand darin saß.
Pero el agua está más caliente
al no haber entrado nadie.
Pero el agua está más caliente
al no haber entrado nadie.
Et un bain où personne n’est allé
étant plus chaud,
Però l'acqua nella vasca è molto calda,
non essendoci ancora entrato nessuno.
Entretanto, a água do banho é a mais
quente porque ninguém entrou ainda.
Однако вода в ванной горячее
по той же причине.