se·nil·i·ty /sɪˈnɪləti ||sɛ-/
  高齡,老邁,老態龍鐘
  se·nil·i·ty /sɪˈnɪlətɪ , sɛ-/ 名詞
  年老,衰老
  Se·nil·i·ty n.  The quality or state of being senile; old age.
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  senility
       n 1: mental infirmity as a consequence of old age; sometimes
            shown by foolish infatuations [syn: dotage, second
            childhood]
       2: the state of being senile