The Collaborative International Dictionary of English v.0.48:
Agedness \A"ged*ness\, n. The quality of being aged; oldness. [1913 Webster] Custom without truth is but agedness of error. --Milton. [1913 Webster]WordNet (r) 3.0 (2006):
agedness n 1: the property characteristic of old age [syn: agedness, senescence]