Deixo um pouco do texto, tirado do The Atlantic:

«What causes productivity to "turn off" after marriage? The study hypothesizes that chemicals are ultimately to blame - in particular testosterone, which falls after marriage (and rises again in the case of divorce). [...] the few women studied to not exhibit a similar hormonally-driven achievement curve; they tend to achieve steadily throughout their lives.»

Fonte original: Why productivity fades with age: The crime–genius connection.