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Why do very old men lose most of their beard?

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  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. :)
     
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