* Gender equality. Because more women are now financially independent, they don't have to marry and/or have children and choose career instead.
* Hypergamy. There are millions of high achieving single women in their 30s who struggle to find a partner while at the same time their fertility is falling.
* Divorce statistics. Divorce rate is high, most divorces are initiated by women and most men end up losing a lot, which causes more men to abstain from marriage and/or kids.
* Ever rising cost of life and standards. In UK for instance real estate prices are growing way out of proportion compared to income.