In A New Deal For Manifold, the staff mentioned that

Users under 18 years of age may no longer be permitted to use the site.

which, if implemented, would mean that I would not be able to use Manifold anymore.

Resolves YES if users under 18 years old can create markets, make bets in mana, be paid out in mana and collect streak/referral bonuses. Resolves NO if they can't do at least one of these actions. If users under 18 years old cannot convert mana into real money, that is irrelevant towards resolution. If Manifold implements KYC for doing one of the above following actions but users under 18 years old cannot be verified, then this market resolves YES.

If Manifold requires verification for accounts over a certain threshold, and users under 18 years old cannot do verification, and it is impossible to bring your account to a state that doesn't require verification after going over the threshold, then this market resolves YES.