There is some evidence of brain under development in adolescents, those from 13 through as high as 23 or 24, that is linked to judgment, decision making, risk appetite, etc., mostly in an unfavourable way as it relates to properly evaluating a flight.
See: http://www.nimh.nih.gov/health/publications/the-teen-brain-still-under-construction/index.shtml
Does this suggest that CFIs training an adolescent should approach the training differently than how they train adults? Are additional training and scrutiny indicated in order to minimize the effects of an under developed brain in this population group? Or does doing so somehow cause some level of unwarranted discriminating practices to an adolescent training for his pilot certificates?