Verse 45

जडमेव समभ्येति पुनर्मरणवाडवः ।जन्म बाल्यं व्रजत्येतद्यौवनं युवता जराम्

In plain words

The submarine fire of death comes again only to the dull one (jaḍa). Birth passes into childhood, this into youth, youthfulness into old age,