As people celebrate International Women's Day on Sunday, the United Nations said the gender pay gap will not close in seven decades across the world if it continues to reduce at its current rate, the Guardian reports.

A recent report from the International Labor Organization (or, ILO) estimates women would earn 77 percent of their male counterpart's income, even 50 years after the United States passed the Equal Pay Act.

Women also face a "motherhood pay gap" where women with children are paid less than women without.

The report also shows the gender gap in work participation has barely shifted in the past 20 years when 50 percent of the world's women work compared with 77 percent of men.

"The overriding conclusion 20 years on from Beijing is that, despite marginal progress, we have years, even decades, to go until women enjoy the same rights and benefits as men at work," said Shauna Olney, chief of the gender, equality and Diversity branch of the ILO.

The Beijing Declaration on women's rights was signed by 189 governments in 1995.

Phumzile Mlambo-Ngcuka, the head of the U.N. agency promoting equality for women, said not one country has reached gender parity and equality in the 20 years since 189 countries vowed to achieve equality for women, Fox News reports.

"We just don't have critical mass to say that post-Beijing women have reached a tipping point in their representation," she said. "The sheer scale of the use of rape that we've seen post-Beijing I think tells us that the women's bodies are viewed not as something to respect, but as something that men have the right to control and to abuse."

According to her, a girl born today will be an 81-year-old grandmother before she has the same chance as a man in becoming the CEO of a company.