Block website access until users confirm an appropriate age. Redirect them if they don't meet your age requirements. The below is a preview, this will typically cover a whole page and block access.
This will check to make sure you're at least 21.
If you're reading this, it means you're... well, let's just say vintage. 😉 No worries, though! To test again, simply clear your cookies or hop into incognito mode for a fresh start!