"Demographic changes" refers to shifts or variations in the characteristics of a population, such as its age, gender, race, ethnicity, or socioeconomic status. Full definition
Changes in elementary and secondary school enrollment are largely reflective of demographic changes in the population. (nces.ed.gov)
People are weary of sudden demographic change in their community. (politics.co.uk)
It is predicted that the effects of demographic change on the health and welfare system as well as the labour market will be drastic. (blog.politics.ox.ac.uk)