Garuda Purana explains the make up of the physical body as well as the subtle body with the six Chakras, and advises that we breathe 21600 times during 24 hours and that each inhaling and exhaling be made into an act of japa mala with such mantras as Soham, Hare Ram etc. The human body is subject to disease, old age, infirmity etc. While the senses are working, practice self-realisation. Therefore make good use of time for self-realisation. Youth does not come back.
Wealth is like a dream that can vanish.
Death can come during waking hours and during sleep. We feed ourselves with sensual pleasures. Surrounded by love and hatred, Chinta or worries eat the alive and Chita eats the dead. Contentment brings happiness and attachment produces misery. Bound by iron chains can be loosened, but worldly attachments, which are invisible, are very difficult to detach.