Schrödinger's 17

When an attractive person’s age is unknown but probably 17 or 18, they can be referred to as Schrödinger's 17. This means they’re assumed to be simultaneously underage and of age, and that for the sake of safety one should round down and not flirt with them just to be safe.

Schrödinger's 17 is particularly a problem for seniors in high school and freshman in college because that is the confusing turning point where teens go from being an underaged minor to being a legal adult.

“Idk man she’s really pretty but I don’t wanna flirt with her until I’m sure she’s old enough. I’m not tryna catch a case.”
“Classic Schrödinger's 17.”