cut their wisdom teeth

wisdom tooth

noun
1.
the third molar on each side of the upper and lower jaws: the last tooth to erupt.
Idioms
2.
cut one's wisdom teeth, to attain maturity or discretion.

Origin:
1660–70

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
wisdom tooth
 
n
1.  Technical name: third molar any of the four molar teeth, one at the back of each side of the jaw, that are the last of the permanent teeth to erupt
2.  cut one's wisdom teeth to arrive at the age of discretion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

wisdom tooth wis·dom tooth (wĭz'dəm)
n.
The third molar tooth on both sides of each jaw that erupts from the 17th to the 23rd year.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
wisdom tooth   (wĭz'dəm)  Pronunciation Key 
One of four molars, the last on each side of both jaws in humans, usually appearing in young adulthood.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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