Are questions and answers limited to adult/educator/parent accounts only?

Hello,

To answer your question, yes. Accounts that are unverified, under the age of 13, or banned from the support community can't post questions or answers. If any of these users try to log in on a support community page, they will be redirected to this page: https://support.khanacademy.org/hc/en-us/articles/231279688

I hope this answers your question.