I agree with Anne and FT that forcing age verification is not the solution to this problem. All the proposed solutions (creating IDs, sending letters to parents, asking to get parents' credit card etc.) have flaws in them. Moreover, putting more controls is going to allow mushrooming of another type of underground activities, like selling of stolen identity information to kids (in exchange for all kinds of things). This could lead to more frustration in teens and they would take out their frustration in other avenues.