Demographic trends in the 2000s showed the continuing separation of family and household because of factors such as childbearing among single parents, the dissolution of cohabiting unions, divorce, repartnering, and remarriage. The transnational families of many immigrants also displayed this separation, as families extended across borders. In addition, demographers demonstrated during the decade that trends such as marriage and divorce were diverging according to education. Moreover, demographic trends in the age structure of the population showed that a large increase in the elderly population will occur in the 2010s. Overall, demographic trends produced an increased complexity of family life and a more ambiguous and fluid set of categories than demographers are accustomed to measuring.