From: Observational research with adolescents: a framework for the management of the parental permission
 | Preadolescence | Early Adolescence | Middle Adolescence | Late Adolescence |
---|---|---|---|---|
Girls | 9-12 yrs. | 12-14 yrs. | 14-16 yrs. | 16-18 yrs. |
Boys | 10-13 yrs. | 13-15 yrs. | 15-17 yrs. | 17-18 yrs. |