hoary vs senescent

hoary

adj
  • Old or old-fashioned; trite. 

  • Covered with short, dense, greyish white hairs. 

  • Of a pale silvery grey. 

  • White, whitish, or greyish-white. 

  • White or grey with age. 

senescent

adj
  • Characteristic of old age. 

  • That ceases to divide. 

  • Growing old; decaying with the lapse of time. 

How often have the words hoary and senescent occurred in a corpus of books? (source: Google Ngram Viewer )