Occurrence Midlife crisis

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^ why men go through midlife crisis? . psychology today. 
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^ stern, theodore a.; fava, maurizio; wilens, timothy e.; rosenbaum, jerrold f. (13 february 2015). massachusetts general hospital comprehensive clinical psychiatry . elsevier health sciences – via google books. 
^ warning signs of midlife crisis - http://www.drphil.com/articles/article/694