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middle youth

British  

noun

  1. the period of life between about 30 and 50

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Accordingly, Morrissey has unexpectedly dissented from the "middle youth" nostalgia circuit that all pop music has now devolved into.

From The Guardian

Nearly all the graduates of the United-States Military Academy who achieved distinction were in what might be termed their middle youth; a few were in their twenties; none were old.

From Project Gutenberg

Because in middle youth he had often sat observing through a rondel of bossed glass of a multicoloured pane the spectacle offered with continual changes of the thoroughfare without, pedestrians, quadrupeds, velocipedes, vehicles, passing slowly, quickly, evenly, round and round and round the rim of a round and round precipitous globe.

From Project Gutenberg