se·nes·cence /sɪˈnɛsṇ(t)s/
  老朽,衰老
  se·nes·cence /sɪˈnɛsṇ(t)s/ 名詞
  衰老或稱“老化”
  Se·nes·cence n.  The state of growing old; decay by time.
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  senescence
       n 1: the organic process of growing older and showing the effects
            of increasing age [syn: aging, ageing]
       2: the property characteristic of old age [syn: agedness]