Greybeard in a Sentence 

Definition of Greybeard  

an old man, especially a wise one

Examples of Greybeard in a sentence

The greybeard professor has been teaching psychology at the college level for over thirty years.  
Sounding like a greybeard, the boy was wise beyond years and behaved more like an old man than a teenager.  
Although he is a greybeard, my eighty-year-old grandfather tries to act as if he is young whipper-snapper.  

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