de·crep·i·tude /dɪˈkrɛpəˌtud, ˌtjud/
  衰老,老耄,老朽
  De·crep·i·tude n.  The broken state produced by decay and the infirmities of age; infirm old age.
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  decrepitude
       n : a state of deterioration due to old age or long use [syn: dilapidation]