a.

1. 人口統計學的；人口學的
   According to demographic studies, Taiwan will step into a society of senior citizens in the next 10 years.

   根據人口學的研究，台灣在未來十年之內將步入老人社會。

adj.

n.

1. (demographics) statistical data relating to the population and particular groups within it.
2. a particular sector of a population:
   the drink is popular with a young demographic.