«أَحَدُهُمَا قَدْ ذَهَبَ مِنْهُ الْأَطْيَبَانِ، وَالْآخَرُ كَأَنَّهُ قَضِيبُ الْبَانِ»
One had lost two pleasures of life, while the other was like a slender branch of the bān tree.
Al-aṭyabān is glossed as the pleasures of eating and marital intimacy, suggesting old age. The bān branch likens the young man to a straight, slender shoot. The pairing vividly establishes contrast before either speaker argues.