Age verification through Google.
 

Google is sleeping.
They already have the software for "sign in with google" popping up
every where, so why not do age verification also?
Once a user was age verified through google then they would be verified on every site that used the "sign in with google plugin".

Google could charge websites for the service while attracting more users to use google services.

If I thought google would do this then I would buy stock.

Before you knock this idea, check out "Id.me"; which is doing ID verification for U.S. Government agency websites.

:2 cents:

'Tis true... :2 cents:

Google already knows more about you than a close family member does! Your age shouldnt be a difficulty for them.