Beards Make Us Look Older
When we were underage in high school, we always got our prematurely hirsute classmates to buy beer because their five o’clock shadows made them look older. Stubble made an 18 year old less likely to get asked for I.D. (or at least made a fake I.D. more believable). Having said that, teens nowadays are getting away with underage drinking much more easily without beards, due to the believability and realistic look of Arizona Fake Id. Despite this, for adults, I think the same beard principle applies.