Webster's English Dictionary

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superannuated

su.per.an.nu.at.ed aj [ML superannuatus, pp. of superannuari to be too old, 
   fr. L supe]r- + annus year - more at ANNUAL : rated no longer fully or 
   passably efficient in one's job because of age  : incapacitated or 
   disqualified for active duty by advanced age