> ## Documentation Index
> Fetch the complete documentation index at: https://glossary.micahealth.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Age or age group

A participation requirement that specifies the allowed age range for study participants, either as a specific age or within defined groups: Child (birth-17), Adult (18-64), or Older Adult (65+).

## Related terms

<CardGroup cols={3}>
  <Card title="Eligibility criteria" href="eligibility_criteria" />
</CardGroup>

[*Source*](https://clinicaltrials.gov/study-basics/glossary)