The Collaborative International Dictionary of English v.0.48:

Eld \Eld\, v. i.
   To age; to grow old. [Obs.]
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The Collaborative International Dictionary of English v.0.48:

Eld \Eld\, v. t.
   To make old or ancient. [Obs.]
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         Time, that eldeth all things.            --Rom. of R.
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The Collaborative International Dictionary of English v.0.48:

Eld \Eld\ ([e^]ld), a. [AS. eald.]
   Old. [Obs.] --Chaucer.
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The Collaborative International Dictionary of English v.0.48:

Eld \Eld\, n. [AS. yldu, yldo, eldo, old age, fr. ald, eald,
   old. See Old.]
   1. Age; esp., old age. [Obs. or Archaic]
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            As sooth is said, eelde hath great avantage.
                                                  --Chaucer.
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            Great Nature, ever young, yet full of eld.
                                                  --Spenser.
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   2. Old times; former days; antiquity. [Poetic]
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            Astrologers and men of eld.           --Longfellow.
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WordNet (r) 3.0 (2006):

eld
    n 1: a late time of life; "old age is not for sissies"; "he's
         showing his years"; "age hasn't slowed him down at all"; "a
         beard white with eld"; "on the brink of geezerhood" [syn:
         old age, years, age, eld, geezerhood]
    2: a time of life (usually defined in years) at which some
       particular qualification or power arises; "she was now of
       school age"; "tall for his eld" [syn: age, eld]