Gender Gap in academics

Gangan Prathap, the vice-chancellor of CUSAT, writes about the gender gap in academics. He states that in terms of financial (net-worth) returns, ONLY in the very long term is it better to be a man. He concludes

By working with a sample where men and women have nearly identical backgrounds, it is seen that between the ages of 30 and 40 years, women actually have a positive gender pay advantage and lose this only after 40 years of age.

Despite this, I find that in IIT/IISc, though nearly 50% of the students in chemistry and biology are women, less than 10% of the faculty in these departments are women.