COPA, or COPPA? There is a difference.
A statement that you must be (13 or older) or (of legal age) in order to submit an application online for employment, a deposit or loan should suffice. The key is to not collect data from children under COPPA. Where do you collect this? That is where I'd add the warning.
My opinions are not necessarily my employers.
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell