The Collaborative International Dictionary of English v.0.48:

Vintage \Vint"age\ (?; 48), n. [Corrupted by influence of
   vintner, vintry, from OE. vindage, vendage, for vendange, OF.
   vendenge, F. vendange, from L. vindemia; vinum wine, grapes +
   demere to take off; de + emere, originally, to take. See
   Wine, Redeem, and cf. Vindemial.]
   1. The produce of the vine for one season, in grapes or in
      wine; as, the vintage is abundant; the vintage of 1840.
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   2. The act or time of gathering the crop of grapes, or making
      the wine for a season.
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   Vintage spring, a wine fount.

   Vintage time, the time of gathering grapes and making wine.
      --Milton.
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