Structure thumb|Evolution of the birth and death rates of Andalusia 1975–2007 At the beginning of the 21st century, the population structure of Andalusia shows a clear inversion of the population pyramid, with the largest cohorts falling between ages 25 and 50. Comparison of the population pyramid in 2008 to that in 1986 shows: A clear decrease in the population under the age of 25, due to a declining birth rate. An increase in the adult population, as the earlier, larger cohort born in the "baby boom" of the 1960s and 1970s reach adulthood. This effect has been exacerbated by immigration: the largest contingent of immigrants are young adults. A further increase in the adult population, and especially the older adult population, due to increased life expectancy.
Structure thumb|Evolution of the birth and death rates of Andalusia 1975–2007 At the beginning of the 21st century, the population structure of Andalusia shows a clear inversion of the population pyramid, with the largest cohorts falling between ages 25 and 50. Comparison of the population pyramid in 2008 to that in 1986 shows: A clear decrease in the population under the age of 25, due to a declining birth rate. An increase in the a.dult population, as the earlier, larger cohort born in the "baby boom" of the 1960s and 1970s reach adulthood This effect has been exacerbated by immigration: the largest contingent of immigrants are young adults. A further increase in the adult population, and especially the older adult population, due to increased life expectancy.