I've tried looking this up but haven't found anything listing whether or not there is an age limit for the site? My youngest sister has been interested in this site since I showed her some of my pets, and she keeps talking about wanting to join. But I'm personally a teensy bit concerned about age limits and such, especially since she's young and pretty sheltered and a few of the breedings and such have gotten pretty mature lately xD
If there's an age limit, I'll make sure she waits to join until she's old enough. If there's not, I'll probably help monitor her use and steer her away from anything with a "Mature" tag in it. I just don't want her joining the site if it's breaking any rules.