We recommend using DiSC with adults only; however, the reading level for all profiles is aimed at a 5th grade reading level. The questionnaire has a Flesch Reading Ease score of 74.2 and Flesch-Kincaid Grade Level of 4.7 and there is no time limit for completing it. We have customers who have used Everything DiSC Workplace or The Five Behaviors Personal Development with older teens, but our products have not been validated with a younger population.