Why do very old men lose most of their beard?

[haruna]

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.

 

[1KRC]

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.

Testosterone or the lack there of and Genetics, is the culprit. :)