The main reason for this trend is fear of divorce.
Many of these people have seen parents, siblings, friends, etc. go through nasty divorces and don’t want to live through the experience themselves.
Women often complain that there aren’t many available and suitable men, or that men are afraid of commitment. But it’s not fear of commitment. It’s fear of finding themselves separated from their children and sometimes having to pay for their wife’s second family. And, of course,women are afraid of being deserted, too - being traded in for a younger model. It’s a self-perpetuating trend.
One reason why I don't date.