“European demographers even have an elegant name for the phenomenon: They call it the Second Demographic Transition (the First being the shift from high birth rates and death rates to low ones that began in Europe in the early industrial era and by now encompasses almost every society). In the schema of the Second Demographic Transition, long, stable marriages are out, and divorce or separation are in, along with serial cohabitation and increasingly contingent liaisons. Not surprisingly, this new environment of perennially conditional, no-fault unions was also seen as ushering in an era of more or less permanent sub-replacement fertility.
“According to Eurostat, the European Union’s statistical agency, the probability of marriage before age 50 has been plummeting for European women and men, while the chance of divorce for those who do marry has been soaring. In Belgium—the birth-land of the scholars who initially detected this Second Transition—the likelihood of a first marriage for a woman of reproductive age is now down to 40%, and the likelihood of divorce is over 50%. This means that in Belgium the odds of getting married and staying married are under one in five. A number of other European countries have similar or even lower odds.”
(From “The global flight from the family” by Nicholas Eberstadt, found at AEI and mentioned at Marginal Revolution)