To maintain full functionality, you could be asked to scan your face or provide an ID that proves you're an adult.

Discord has announced a shift in its age verification strategy, moving toward an "age prediction" system that targets only suspicious accounts rather than requiring all users to undergo facial scans ...

This “teen-by-default” setting is meant to protect new and existing users from encountering age-restricted subsections of Discord servers as well as prevent underaged users from doing certain things ...