senescence

Noun
Synonyms: agingageingagedness

WordNet 3.0

Noun (2)

  1. the organic process of growing older and showing the effects of increasing ageSynonyms: agingageing
  2. the property characteristic of old ageSynonyms: agedness
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Webster's Dictionary (GCIDE)

Senescence \Se*nes"cence\, n. [See Senescent.] The state of growing old; decay by time. [1913 Webster]
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