It's neither normal nor literate IMO.This "finds the adolescent unprepared to meet it"'s subject is not a person but a thing. Is this kind of expression normal or literate? Why is a subject of a thing accompany "find" and what does it mean?
ex)Youth is a time of conflict...since the adolescent at one and the same time needs both a feeling of security and an opportunity for self-expression and self-determination. Too much and too suddenly gained liberty finds the adolescent unprepared to meet it; then he may become prey to undesirable influences...
Student or Learner