from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of or relating to the last phase of life.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of or pertaining to old age or the elderly.
- adj. Of or pertaining to senescent animals or plants.
from The Century Dictionary and Cyclopedia
- Having the characters of old age or senility: specially applied to one of the stages in the growth and decline of the individual, bearing characteristics peculiar to itself, but reproducing in part those of the infantile stage.
First attested in the late 19th century. From Ancient Greek γέρων (gerōn, "old man"). (Wiktionary)