A demographer statistically studies the population and may track trends such as birth/death rates, gender ratios, age ratios, living conditions, etc.
United States Census Bureau
To become a demographer, you must have a bachelor's degree in a social science field. An advanced degree in demography or another related field is suggested. You need to be comfortable with mathematics and statistics. Demographers are comfortable with mathematics and statistics. They also have good research and computer skills.
National Average Salary:
How will your economics degree help in this field?
As a demographer you study some of the same things that are of interest to an economist. Like an economist, you will use statistics and computer programs to understand how various aspects of society are functioning.