A website called Cut.com had bartenders try to guess if people were over 21 or not, and they were pretty bad at it. 

I waited tables and bartended for almost 10 years, and I like to think I'm pretty good at guessing people's age, especially guessing whether or not they're legally old enough to order a drink. But I have to be honest, I missed some of these!

When I was in high school, I LOOKED like I was in high school. No one was going to mistake me for a legal adult. Today, these kids look like they're 30, when they're really 17. It's ridiculous!