Chapter 1, Part 7 - Lieh Tzu

Between his birth and his latter end, man passes through four chief stages-infancy, adolescence, old age and death. In infancy, the vital force is concentrated, the will is undivided, and the general harmony of the system is perfect. External objects produce no injurious impression, and to the moral nature nothing can be added. In adolescence, the animal passions are wildly exuberant, the heart is filled with rising desires and preoccupations. The man is open to attack by the objects of sense, and thus his moral nature becomes enfeebled.

In old age, his desires and preoccupations have lost their keenness, and the bodily frame seeks for repose. External objects no longer hold the first place in his regard. In this state, though not attaining to the perfection of infancy, he is already different from what he was in adolescence. In death, he comes to his rest, and returns to the Absolute.
~ Lionel Giles translation via Terebess Asia Online ~

Go here to read the introductory post to the chapters of the Book of Lieh Tzu.