Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Why do very old men lose most of their beard?

Tags:
  1. Dec 26, 2014 #1
    Well, this is a pretty straightforward question : Why do the hairs on the beard of very old men thin out and fall off leaving bald in the face, so to speak?
    I am asking this question with Raymond Smullyan in mind. In photographs, he certainly has much less beard now that he's 95, than 20 years ago.
     
  2. jcsd
  3. Dec 27, 2014 #2
    Testosterone or the lack there of and Genetics, is the culprit. :)
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook