An example of an aggregate is which of the following?

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An aggregate is a group of individuals who share a defining characteristic and are analyzed as a unit to understand health patterns. The group of people aged 65 and older fits this well because it defines a subset of the population by a common attribute (age), enabling analysis of health trends, risks, and needs in that specific group. A single patient with a disease is an individual, not an aggregate. A hospital ward is a care setting, not a population defined by a shared trait. A geographic region could form an aggregate if you group people by location, but the age-based group is the clearest example of aggregating people by a common characteristic for analysis.