They are called infancy, childhood, youth, manhood, maturity, age, and dotage.
"These persons are very unlike one another.

Striking physical, mental, and moral differences exist between them.

Infancy and childhood are incomprehensible to manhood, and manhood not less so to them.

The youth looks forward with disgust to the old age which is to follow him, and the old man has far more in common with other old men, his own contemporaries, than with the youth who preceded him.

How frequently do we see the youth vicious and depraved, and the man who follows him upright and virtuous, hating iniquity! How often, on the other hand, is a pure and innocent girlhood succeeded by a dissolute and shameless womanhood! In many cases age looks back upon youth with inexpressible longing and tenderness, and quite as often with shame and remorse; but in all cases with the same consciousness of profound contrast, and of a great gulf fixed between.
"If the series of persons which constitutes an individual could by any magic be brought together and these persons confronted with one another, in how many cases would the result be mutual misunderstanding, disgust, and even animosity?
Suppose, for instance, that Saul, the persecutor of the disciples of Jesus, who held the garments of them that stoned Stephen, should be confronted with his later self, Paul the apostle, would there not be reason to anticipate a stormy interview?
For there is no more ground to suppose that Saul would be converted to Paul's view than the reverse.