Here is information regarding minors that can be found in the Privacy information section here on the forum:
Children’s Online Privacy Protection Act Compliance
Our site, products and services are all directed to people who are at least 13 years old or older. If this server is in the USA, and you are under the age of 13, per the requirements of COPPA (Children’s Online Privacy Protection Act), do not use this site.
Here is a link to the Privacy section:
It can be found by going into your Category area, and then scrolling down to the bottom of that area, and then clicking on FAQ (frequently asked questions).
Editing to add that when you sign up on a website, this is one of the reasons that you’re asked for your birth date, so that you’re eligible to participate on the website.
You may also be asked for your birth date in case the website that you’re visiting is offering some kind of coupon or sweepstakes offer and so on, so that if you’re interested, you’re also old enough to participate in the offer.