Yet you did imply it, as I said, by mentioning the age of the persons involved.

There is no accurate way to know age, without some form of identity or age verification. Presuming a child will have an account marked "child" is folly, for kids can just sign up without a parent's knowledge, creating a second account. If the goal is to actually protect and be a pseudo parent for the child, then actually ensuring that a child cannot have an adult account is part of that.

My point is, TSA style "we're doing things which look secure, but are not helpful and only inconvenient" isn't going to help. It will only give the appearance, not the actualized result of security.