"Commencing with the invocation of God, Augustine relates in detail the beginning of his life, infancy, and boyhood up to his fifteenth year."

"Of the seventeenth, eighteenth, and nineteenth years of his age, passed at Carthage,..."

"Then follows a period of nine years from the nineteenth year of his age.."

"He advances to puberty, and indeed to the early part of the sixteenth year of his age,..."