A Cross-National Study of Adolescent Self-Image Adolescence is not, as has been previously assumed, a developmental stage that was defined after the industrial revolution. There is substan tial historical evidence to suggest that adolescence and youth, as a stage, was recognized by the ancient Romans, Greeks, and even Egyp tians. The concept survived through the Dark Ages. In Le Grand Pro prietaire, written in 1556, it is stated: "The third age, which is called adolescence, . . . ends in the twenty-first year . . . and it can go on till thirty or thirty-five. The age is called adolescence...

A Cross-National Study of Adolescent Self-Image Adolescence is not, as has been previously assumed, a developmental stage that was defined after the industrial revolution. There is substan- tial historical evidence to suggest that adolescence and youth, as a stage, was recognized by the ancient Romans, Greeks, and even Egyp- tians. The concept survived through the Dark Ages. In Le Grand Pro- prietaire, written in 1556, it is stated: "The third age, which is called adolescence, . . . ends in the twenty-first year . . . and it can go on till thirty or thirty-five. The age is called adolescence...