जीर्यन्ति जीर्यतः केशा दन्ता जीर्यन्ति जीर्यत: । चक्षु:श्रोत्रे च जीर्येते तृष्णैका न तु जीर्यते,मनुष्यके जीर्ण (जराग्रस्त) होनेपर उसके केश जीर्ण होकर झड़ जाते हैं, वृद्ध पुरुषके दाँत भी टूट जाते हैं, नेत्र और कान भी जीर्ण होकर अन्धे-बहरे हो जाते हैं। केवल तृष्णा ही जीर्ण नहीं होती है (वह सदा नयी-नवेली बनी रहती है)
jīryanti jīryataḥ keśā dantā jīryanti jīryataḥ | cakṣuḥśrotre ca jīryete tṛṣṇaikā na tu jīryate ||
Bhishma said: “As a person grows old, the hair withers and falls; the teeth too decay with age. The eyes and ears also grow feeble. Yet craving alone does not grow old—it remains ever fresh.”
भीष्म उवाच
Physical faculties inevitably decline with age, but craving (tṛṣṇā) can remain undiminished; therefore one should cultivate restraint and detachment deliberately, rather than assuming old age will automatically end desire.
In Anuśāsana Parva, Bhīṣma is instructing Yudhiṣṭhira on dharma and right conduct; here he offers a reflective maxim about aging to underscore the moral need to govern desire.