Board Thread:General Discussion/@comment-27745707-20190424022220/@comment-1038387-20190424074459

IIRC that's mainly a legal thing - per COPPA, users under 13 could be allowed an account if their parents/guardians agreed. However, it's such a hassle to a) have people submit that info and b) verify the supplied information that most if not all tech companies don't actually do that, it's just there for form.