Why does unconscious bias against British women only really start at age 40?

From http://www.dailymail.co.uk/news/article-3874230/Gender-pay-gap-remains-18-cent-Britain-slumps-20th-global-sex-equality-rankings-RWANDA.html

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Many male-dominated occupations require little social contact @EricCrampton @worstall @SteveStuWill

Source: Bureau of Labor Statistics, U.S. Department of Labor, The Economics Daily, Working alone: jobs that required little personal interaction in 2017 on the Internet at https://www.bls.gov/opub/ted/2017/working-alone-jobs-that-required-little-personal-interaction-in-2017.htm (visited December 09, 2017).