Why do we do the parent/guardian notification form?

We have set up the 21 age not for legal reasons, but as a goodwill gesture towards the parents. We want to make sure that at this time in their life, when they can still be dependent on their parents for schooling, etc., we have received the parents blessing for them to spend their summer at our training. We want to make sure that the parents are supportive and behind the decision and not surprised when the student informs their parents where they are headed for the summer.  We just wanted to make sure the parents have been informed and are ok with the decision.  We picked 21 as the age because they are mostly still in school until then and still under the support of their parent. There is a place on the application for the student to say they are no longer supported in any way financially by the parent, and if they choose that, then the parent is not contacted for consent, and their consent is not needed to complete the application.