#greybeard__old_man__graybeard__Methuselah  a man who is very old
  supertype:  oldster  adult_man
  subtype:  old_codger__oldcodger__codger  used affectionately to refer to an eccentric but amusing old man
  subtype:  patriarch.greybeard  a man who is older and higher in rank than yourself
  subtype:  mossback__old-timer__oldtimer__gaffer__old_geezer__oldgeezer__antique  an elderly man

No statement uses or specializes greybeard; click here to add one.