YouTube will begin guessing users’ ages using artificial intelligence on Wednesday, as part of an effort to prevent kids from accessing inappropriate content online.

If the technology incorrectly estimates a user to be under 18, they can verify with a credit card or a government ID. YouTube said it will only allow users who have been verified over 18 to view age-restricted content that may be inappropriate for younger users.

Critics have raised concerns about privacy as well as access to the platform for users falsely flagged as underage.