Age ranges are often determined based on the nature of the study and the disease being investigated. Common age categories include infants (0-1 year), children (2-12 years), adolescents (13-18 years), adults (19-64 years), and the elderly (65+ years). These groups can be further subdivided depending on the specific research question. For example, in a study on [pediatric health](), age ranges might be broken down into smaller intervals such as 0-5 years and 6-12 years.
