Why does everyone think that a real programmer must wear a beard?

Question

What do you think and Is it so?
Maybe it's a stereotype?
Or a relic of the past?

Answer 1

Nope, 2 Programmers I know got no beard, lol

Answer 2

because they have no time to shave, there's only eat, drink coffee, code, repeat ... no time in between

Answer 3

Because of this: lol
https://pbs.twimg.com/media/A4y2092CIAA4kKj.jpg

Answer 4

because they work under prussure

Answer 5

Agree that people with beards are perceived as wise. Look for example at a foto of Stallman or Ritchie.