relating to demography (= the study of populations and the different groups that make them up)

There have been monumental social and demographic changes in the country. 该国的社会和人口状况已经发生了巨大的变化。

current demographic trends 目前的人口发展趋势

a group of people, for example customers, who are similar in age, social class, etc.

This demographic (young teenagers) is the fastest-growing age group using the site. 该族群（十几岁的年轻人）是使用这个网站人数增长最快的年龄群体。