agedistribution aging assimilation(sociology) burma canada conflictofgenerations congresses costarica demographictransition economicaspects economicconditions emigrationandimmigration employmentforecasting europe europeanunioncountries fertility fullemploymentpolicies germany governmentpolicy history human immigrants intergenerationalrelations internal japan labormarket laborsupply lifespan manpowerpolicy migration mortality oldagepensions olderpeople pensions population populationaging populationforecasting productive retirement sexdistribution(demography) socialaspects socialconditions socialpolicy socialsecurity statistics structuralunemployment targetmarketing unemployment unitedstates vital vitalstatistics