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!
Boasting about his health conditions. 
It's common in seniors.
يتباهى بوضعه الصحّي. هذا شائع بين الكبار
Ein Alter, der mit
seinen vielen Leiden angibt.
Presume de sus enfermedades.
Es común en los viejos.
Presume de sus enfermedades.
Es común en los viejos.
– Et lui, alors ?
– Il se plaint de ses douleurs de vieux.
Parlare a tutti delle proprie condizioni
di salute è comune tra gli anziani.
Falando sobre sua saúde. É 
bem comum entre os senhores.
Жалуется на здоровье, как и все старики.