-Discharged, esp with a pension, owing to age or illness.
-Too old to serve usefully.
-Obsolete through age or new technological or intellectual developments.
-Incapacitated or disqualified for active duty by advanced age.
-Older than the typical member of a specified group.
From Medieval Latin superannātus aged more than one year, from Latin super- + annus a year. 17th century.
Used in a sentence:
“I find myself to be exorbitantly superannuated for this feculence!”
Do you ever find yourself thinking you're just too old for this...er...shall we say, foulness? We have the shirt for you! tinyurl.com/Grand-Feculence-W