Verse 24

शुष्यतः कायसरसः प्रगलद्यौवनाम्भसः ।राजहंसः क्षणादायुरनिवर्ति पलायते

In plain words

As the lake that is the body dries up, its water that is youth draining away, this lifespan, a royal swan, flees in an instant, never to return.