old growth

noun
1.
forest growth consisting of mature or overmature trees.
2.
virgin timber.

Origin:
1880–85

old-growth, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
old growth

noun
forest or woodland having a mature or overly mature ecosystem more or less uninfluenced by human activity 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Species that depend on big stands of old growth, such as marbled murrelets and
  spotted owls, would have much less room to roam.
The financial crisis did not cause the old growth patterns to become
  unsustainable.
The spotted owl was not saved because he was an owl, he was saved because he
  lived in old growth forests.
If you don't believe me, look at the genetic diversity of old growth forests
  and that of new growth forests.
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