Etymology
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demography (n.)

"that branch of anthropology which studies life-conditions of a people by its vital and social statistics," 1880, from Greek dēmos "people" (see demotic) + -graphy.

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demographics (n.)
1967, the science of divining from demographic statistics; see demography + -ics. Originally in reference to TV audiences and advertisers.
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demographic (adj.)

1882, "of or pertaining to demography," from demography + -ic. As a noun, by 1998, short for demographic group or category. Related: Demographical; demographically; demographer (1877).

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