Earlier quoted context omitted.
Why should there be age restrictions once you're legally an adult at 18? 21 is unnecessarily puritanical (EU countries don't have that) and most teenagers are going to drink anyway, just as they're going to find a way to bypass age verifications for their social media of choice.
Maybe the law could have different ages for beer and distilled spirits. Let the kids have a beer at 16 or 18. I have the same feeling about motorcycles. The age for riding them should be a bit later, when you've acquired some sense. Maybe 21 or even 24.
Maybe some type of tiered system could be in place. Text one limit, images next and then video one more.