I like the whole Age verify, although one thing most people don't understand is kids under the age 21 have checking accounts, and Credit Cards. My youngest who is 15 has her own bank account and credit card.. And a lot of kids even at 18 have them now.
So really a CC isn't going to do much, I personally think sending in a ID of some form with your legal name and age is the only way to go.
Just my two cents.
Submission is taken, not surrendered, Submission is surrendered not taken, Once you have it, tis up to you to keep it.
What you want isn't what it seems. Look a bit closer and find out what it really is.