Superannuate definitions

so͝o'pər-ăn'yo͝o-āt'
To retire (someone) on a pension because of age or infirmity.
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To set aside or discard as old-fashioned or obsolete.
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To set aside as, or become, old-fashioned or obsolete.
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To retire from service, esp. with a pension, because of old age or infirmity.
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To retire or put out of use due to age.

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(intransitive) To retire due to age.
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To give a pension to, on account of old age or other infirmity; to cause to retire from service on a pension.
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Origin of superannuate

Back-formation from superannuated; Latin super "over" + annus "year"