NOUN (2)

1. the opposite of youngness;

2. the quality of being old; the opposite of newness;

The Collaborative International Dictionary of English v.0.48:

Oldness \Old"ness\, n.
   The state or quality of being old; old age.
   [1913 Webster]

WordNet (r) 3.0 (2006):

oldness
    n 1: the opposite of youngness [ant: youngness]
    2: the quality of being old; the opposite of newness [ant:
       newness]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "oldness":
   advanced age, advanced years, age of retirement,
   an incurable disease, anility, caducity, debility, decline of life,
   declining years, decrepitude, dotage, eld, elderliness, feebleness,
   green old age, hale old age, hoary age, infirm old age, infirmity,
   infirmity of age, longevity, old age, pensionable age, ricketiness,
   ripe old age, second childhood, senectitude, senility,
   senior citizenship, superannuation, the downward slope,
   the golden years, vale of years, white hairs