I had Kidney Puncher on the list as using Ninja.verify but they much have switched. They are now using AgeChecker.net which asks for DOB and address.
On the order confirmation email, it says:
ATTENTION USA CUSTOMERS
Due to the FDA regulations enacted on August 8th 2016, we must verify the age of our customers before we can ship out your order. Before you are able to complete your order you will get a popup window from AgeChecker.net to get the order verified before completion.
If you were able to place your order without receiving this popup, please contact 866 705 5000 Ext 1. By law we are not able to ship an order until the age verification process is completed successfully. If you received the popup, and were able to place the order successfully please ignore the above text.
I got the popup and passed.