“It’s all to do with their brains and bodies and chemicals,” says Sir Anthony Seldon, the master of Wellington College, a posh English boarding school. “There’s a mentality that it’s not cool for them to perform, that it’s not cool to be smart,” suggests Ivan Yip, principal of the Bronx Leadership Academy in New York. One school charges £25,000 (Rs.23.25 lakh) a year and has a scuba-diving club; the other serves subsidised lunches to most of its pupils, a quarter of whom have special needs. Yet both are grappling with the same problem: teenage boys are being left behind by girls.

It’s a problem that would have been unimaginable a few decades ago. Until the 1960s boys spent longer and went further in school than girls, and were more likely to graduate from university. Now, across the rich world and in a growing number of poor countries, the balance has tilted the other way.

The reversal is laid out in a report published on March 5 by the OECD, a Paris-based rich-country think-tank. Boys’ dominance just about endures in maths: at age 15 they are, on average, the equivalent of three months’ schooling ahead of girls. In science the results are fairly even. But in reading, where girls have been ahead for some time, a gulf has appeared. In all 64 countries and economies in the study, girls outperform boys. The average gap is equivalent to an extra year of schooling. The OECD deems literacy to be the most important skill that it assesses, since further learning depends on it.

To see why boys and girls fare so differently in the classroom, first look at what they do outside it. The average 15-year-old girl devotes five-and-a-half hours a week to homework, an hour more than the average boy, who spends more time playing video games and trawling the internet. Three-quarters of girls read for pleasure, compared with little more than half of boys. Reading rates are falling everywhere as screens draw eyes from pages, but boys are giving up faster.

Girls’ educational dominance persists after school. Until a few decades ago men were in a clear majority at university almost everywhere, particularly in advanced courses and in science and engineering. But as higher education has boomed worldwide, women’s enrolment has increased almost twice as fast as men’s. In the OECD, women now make up 56 percent of students enrolled, up from 46 percent in 1985. By 2025, that may rise to 58 percent.

Moreover, women who go to university are more likely than their male peers to graduate, and typically get better grades. But men and women tend to study different subjects, with many women choosing courses in education, health, arts and the humanities, whereas men take up computing, engineering and the exact sciences. In mathematics, women are drawing level; in the life sciences, social sciences, business and law they have moved ahead.

So are women now on their way to becoming the dominant sex? Hanna Rosin’s book, The End of Men and the Rise of Women (2012), argues that in America, at least, women are ahead not only educationally but increasingly also professionally and socially. Policymakers in many countries worry about the prospect of a growing underclass of ill-educated men. That should worry women, too: in the past they have typically married men in their own social group or above. If there are too few of those, many women will have to marry down or not at all.

(Excerpted and adapted from )