Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
The site doesn't exist from more than a year, but there are users who have already the "yearling" badge.
How is that possible?
This is because the site was migrated from Stack Exchange 1.0. The user accounts and their histories all carried through to Stack Exchange 2.0 when the site was migrated to the newer platform.