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There really isn't a way to determine if someone is lying when they indicate their age. Even if you were to implement something like a credit-card check, there's nothing stopping a kid from lifting their parent's credit card out of their wallet, either.
You can't really guarantee that the COPPA forms you might get via mail or fax are legit, either, I wouldn't think.
I don't intend to be a lie detector. I just need a way to make my best effort to determine whether someone is over a certain age. I can't help it if someone lies about that. All I can do is request the information.
My firm opinion is that parents should be responsible for what their kids are doing on the internet and elsewhere.
However, I know that sometimes, even if a kid isn't really trying to do something "naughty", they might see a site, and create an account really quick without even looking at anything that tells them it's not for minors.
The reason I want to be able to ask for a birthdate to restrict by age is so I can do my best to ensure that inappropriate content is not easily available to children, and also so that I can have some level of legal protection, in case someone's precious darling lies about their age and views a page on my site containing the "f" word or something.
I also run a couple of community-based sites that have some areas where teens are allowed, and some where only adults are allowed - not because of risque or naughty content, but because they are places for adults to discuss grownup issues without being interrupted by kiddie stuff.
What you are getting when you have something like this, is the ability to know that _to the best of your knowledge_ that someone is a certain age.
And yes, it would also be nice to easily let users display their age, instead of their birthdate in their profiles. : )
If I were running a site that was actually "adults only", I'd just have a thing that says something like:
"This site is for adults only. Do not view this site if you are under 18. If you are older than 18, click here."
I personally don't currently maintain any sites that allow people under 14 to participate. Frankly, there's simply not enough aspirin in the world for me to want to run a site with younger kids on it. : ) I just have no patience. But it seems like the ability to include COPPA stuff would be a good thing for people for whom it is an issue.
What I see very little of, in any site/CMS software, is any facility for including the sorts of tags that allow those kid-check type things to work... I used to put RSAC tags on my content, to help parents keep their kids from seeing stuff they oughtn't to, but eventually, I just got sick of worrying about some parent getting upset because their little hacker got to see something they shouldn't - while mommy and daddy were not paying attention.
My roomate has a kid, and a 14-year old sister. The roomie keeps the computer in the living room, where she can tell whether they're up to something they shouldn't be. But more than that, she teaches the kids in her care how to be safe and use good judgment, so we don't have to worry much anyway.
Regardless, being able to have a way to restrict access by age would be a _huge_ help to me, and I presume to other people.