How does Chapter 8 portray the typical stages of an unexamined human life, and what is its critique of such an existence?

According to Chapter 8, a typical, unexamined life is largely wasted. It describes life as being consumed by days rising and setting, with half spent in sleep and the rest in restlessness. The chapter details a life cycle where childhood is spent in play, youth is dominated by passion for women, and old age is burdened by infirmity and constant disease. The text critiques this by questioning if the purpose of life is merely to be born, grow strong, and live a long time. It concludes that if life is only about the four activities of eating, sleeping, fear, and mating, then the human birth is useless, no different from that of a dog.