middle-aged

[mid-l-eyjd]
adjective
1.
being of the age intermediate between youth and old age, roughly between 45 and 65.
2.
characteristic of or suitable for persons of this age.

Origin:
1600–10

middle-agedly [mid-l-ey-jid-lee, -eyjd-] , adverb
middle-agedness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
middle-aged
 
adj
of, relating to, or being in the time in a person's life between youth and old age

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Copiers, scanners, and middle-aged committee members will be able to handle
  that.
Another was composed of middle-aged and older patients who'd been diagnosed
  with cardiovascular disease.
As perhaps befits a middle-aged celebration, these are all eminently reasonable
  activities.
If current trends continue, by next year the average middle-aged worker will
  spend less than eight years at the same company.
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