Synonyms: demographic data, demographic variables, user demographics, audience demographics, population characteristics
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Definition
Demographics are measurable population traits: age, gender, income, education, location, language, occupation. A demographic (singular) is a group sharing one trait, as in "the 65+ demographic."
In UX, demographics show who is in your sample. They don't explain behavior. Two 34-year-old accountants can use the same budgeting app in opposite ways.
Use cases
Getting demographics wrong skews research and puts off users.
Skewed sample: A banking app tests with 8 staff, all under 35. It ships with 12px labels older customers can't read.
Stereotype persona: "Sarah, 42, mother of 2" gets a stock photo and a yoga habit. None of it came from research.
Intrusive form: Signup asks for gender and income on screen 1 with no reason given. People quit or answer at random.
Hidden subgroup: Checkout errors look normal in aggregate, so a group failing at 3 times the average goes unnoticed.
How it's used in practice
Set recruiting quotas. For example, at least 2 of 8 participants aged 60+.
Ask only what changes a decision. If an answer wouldn't change anything, cut the question. Recruiting panels already store age and location.
Put questions last and make them optional. Say why you're asking, and offer "prefer to self-describe" in place of "Other."
Segment, then investigate. Split analytics by age or device to find who struggles. Then interview that group.
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Pro-tip: Every demographic detail in a persona should earn its place. If removing it doesn't change a design decision, cut it.
Challenges & limitations
Gaps without causes: NN/g found users 65+ were 43% slower on websites than users aged 21 to 55. The number doesn't say whether text size or tap targets are to blame.
Sensitive data: Racial or ethnic origin and health data are special-category data under GDPR. Collect less, explain why you need it, and protect or anonymize it.
Small samples: Splitting 8 usability participants by age leaves groups of 1 or 2.
