gray-headed vs grey

gray-headed

adj
  • Having gray hair, especially from age 

grey

adj
  • UK and Commonwealth standard spelling of gray. 

  • Synonym of coloured (pertaining to the mixed race of black and white). 

verb
  • UK and Commonwealth standard spelling of gray. 

noun
  • UK and Commonwealth standard spelling of gray. 

How often have the words gray-headed and grey occurred in a corpus of books? (source: Google Ngram Viewer )