Mahabharata 14.93.36

जीर्णेन वयसा पुत्र न मा क्षुद्बाधतेऽपि चदीर्घकालं तपस्तप्तं न मे मरणतो भयम्

jīrṇena vayasā putra na mā kṣudbādhate'pi cadīrghakālaṃ tapastaptaṃ na me maraṇato bhayam

Our plain-language meaning of this verse is waiting for scholar review.