The Continued Eclipse of Heterogeneity in Gerontological Research

Area of Science:

• Gerontology
• Sociology
• Psychology
• Health Sciences

Background:

• Diversity and heterogeneity among older adults are increasingly recognized in gerontology.
• Previous reviews highlighted a lack of attention to age-based variability in research.
• This study assesses current practices in empirical gerontological research regarding age-based variability.

Purpose of the Study:

• To replicate a previous review on the treatment of age-based variability in gerontological research.
• To determine if measures of within-age variability are reported and discussed in empirical studies.
• To identify observed patterns of age-based variability in research outcomes.

Main Methods:

• A systematic review of empirical studies published in six gerontological journals.
• Analysis focused on the reporting and discussion of within-age variability.
• Examination of age-based patterns of variability in study outcomes.

Main Results:

• Most studies did not report or discuss age-based variability.
• Among studies that did, variability was generally stable or increased with age.
• Psychological and social outcomes showed stable variability, while biological/health outcomes increasingly varied with age.

Conclusions:

• Gerontological research continues to prioritize average age group differences over intra-age variability.
• Key issues in social gerontology necessitate greater attention to within-age diversity.
• Understanding intra-age variability is crucial for a comprehensive view of aging.