The EU published a study done on women's labour force engagement last year. Between not working at all (roughly 20%) and working part time (roughly 35%), there wasn't a single EU nation where there was a majority of working age women actually working full time. This heavily implies that someone else is subsidizing these adult women's lives in some capacity, perhaps parents or a spouse or a partner.

In addition, Pew Research asked married, working parents whether they would like to drop to part time or drop out of work altogether to care for their kids. The results were heavily gender leaned. 60% of women said they'd prefer to not work at all. Only 19% of men said the same.

Until those attitudes change, in both men and women, the gaps will persist.