Aging in place, age specific migration and natural decrease

"This analysis of regional demographic change evaluates the roles of 'aging in place' and of age-specific migration on the geographic pattern of the advent of natural decrease in the United States. The spread of natural decrease is projected on the basis of recent births and deaths, in the absence of migration. Age-specific migration data for Oregon and Washington are used to develop a typology of counties that can be used in turn to modify the probable timing of natural decrease."