juvenility

noun
ju·ve·nil·i·ty | \ˌjü-və-ˈni-lə-tē \
plural juvenilities

Definition of juvenility 

1 : the quality or state of being juvenile : youthfulness

2a : immaturity of thought or conduct

b : an instance of being juvenile

First Known Use of juvenility

circa 1623, in the meaning defined at sense 1

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The first known use of juvenility was circa 1623

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